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- CreatorAndrew W. MarloweStarsNathan FillionStana KaticSusan SullivanWhen a psychopath commits murders based on novelist Castle's books, Detective Beckett seeks his help to solve the case. He decides to work with her and uses his experiences as research for his novels.
- DirectorRob BowmanStarsNathan FillionStana KaticSusan SullivanAfter a serial killer starts displaying the victims the way done in Richard "Rick" Castle's books, Castle teams up with Detective Kate Beckett to solve the case. He then starts to shadow her for his new book.
- DirectorJohn TerleskyStarsNathan FillionStana KaticSusan SullivanCastle's first case with the NYPD has him and Beckett solving the case of a nanny found dead in a spin dryer.
- DirectorRob BowmanStarsNathan FillionStana KaticSusan SullivanA clique of rich kids plays Russian Roulette with a bullet-less gun. But one night, a bullet in the chamber kills one of them. When another one supposedly commits suicide, it's up to the team to discover what is what and if the suicide was over guilt.
- DirectorRob BowmanStarsNathan FillionStana KaticJohn PrudhontTwo guys find a rug at a neighborhood dumpster. When they get it home, they were astounded to find a councilman's body inside the rolled up rug. Was this a botched robbery or does this murder have ties to local politics?
- DirectorBryan SpicerStarsNathan FillionStana KaticSusan SullivanA frozen female corpse discovered at a new construction site transforms a cold five-year-old missing persons case into a current homicide investigation.
- DirectorJamie BabbitStarsNathan FillionStana KaticSusan SullivanA ritualistic killer is on the loose while Castle's first ex-wife and Alexis's mom, Meredith visits.
- DirectorDean WhiteStarsNathan FillionStana KaticSusan SullivanCastle is anxiously awaiting the public response to the release of his newest work of fiction. A baffling rash of jewel robberies from the society set prompts Castle to ask Beckett to be his undercover date at a ball to see if the thief might be amongst the affluent set and casing out his victims at charity events, balls, and parties.
- DirectorBryan SpicerStarsNathan FillionStana KaticSusan SullivanA woman found drowned in a bathtub full of motor oil is initially identified as a missing suburban housewife, until it's discovered that her identity had been stolen from a deceased child, and that she had been a fugitive from a terrorism charge for two decades.
- DirectorJohn TerleskyStarsNathan FillionStana KaticSusan SullivanA 2-year-old girl is abducted reuniting Beckett with her ex-boyfriend, FBI agent Will Sorensen.
- DirectorBryan SpicerStarsNathan FillionStana KaticSusan SullivanA plastic surgeon is found murdered with his fingernails ripped off. Castle looks into Beckett's mother's murder despite her protests.
- DirectorRob BowmanStarsNathan FillionStana KaticSusan SullivanA case involving an insurance agent brings Castle and Beckett, who are still on the outs after he looked into her mom's case, back together.
- DirectorRob BowmanStarsNathan FillionStana KaticSusan SullivanTwo murder victims are found prompting Castle and Beckett to bet against Esposito and Ryan to see who solves their case first.
- DirectorDwight H. LittleStarsNathan FillionStana KaticSusan SullivanCastle and Beckett get an inside look at the cutthroat world of the New York fashion industry when they investigate the brutal murder of a young model during Fashion Week.
- DirectorBryan SpicerStarsNathan FillionStana KaticSusan SullivanWhen an Arctic explorer is killed during a polar expedition, the mysterious circumstances of his death take Castle and Beckett from the penthouses of Park Avenue to the halls of the CIA. But Castle's delight at the case's many twists and turns soon turns to frustration as he realizes that their elusive killer might just be fooling them all.
- DirectorJohn TerleskyStarsNathan FillionStana KaticSusan SullivanIllegal Czech immigrant Eliska Sokel's corpse is found hidden in a sewer, two days after her death. Her also-illegal ex, Teodor Hajek, explains she left him after their son died from a congenital disease. She had worked on the concierge staff of a luxury residence but was fired after Dr. Cameron Talbot's wife questioned the appropriateness of her treating their son Zane to a lollipop. Castle wonders how Beckett will take his dedication of a book starring her alter-ego, and his agent Haas's offer of a contract to write 3 British spy novels. They still solve the case after unearthing an old, tragic secret.
- DirectorKaren GaviolaStarsNathan FillionStana KaticSusan SullivanA case near Halloween has Castle and Beckett investigating the death of a man in a graveyard, wearing fangs.
- DirectorRob BowmanStarsNathan FillionStana KaticSusan SullivanA singer is found dead, hanging upside down on a fire escape. Ultimately, it's Alexis who helps solve the case.
- DirectorJonathan FrakesStarsNathan FillionStana KaticSusan SullivanA bike messenger gets hit by a car and his carrier bag stolen. The bag contained evidence pertaining to an old case that Montgomery worked on.
- DirectorBryan SpicerStarsNathan FillionStana KaticSusan SullivanHighly respected A.D.A. Jack Buckley, a tough crime-fighter, was murdered. His ex-brother-in-law Paul Cho, a businessman who likes call girls, was blackmailed by Danton to tell Buckley to back off. Castle and Beckett discover it's all about the discreet cyber-prostitution business, which happens to employ Buckley's legal protégée, Scarlett Price. Working out who took over the 'Danton' franchise when founder Dan Tonelli is jailed, leads to some surprising revelations. Meanwhile, 'cool dad' Castle worries about what secret Alexis shares only with Beckett.
- DirectorHelen ShaverStarsNathan FillionStana KaticSusan SullivanA man leading a double life is found dead in a garbage chute.
- DirectorJohn TerleskyStarsNathan FillionStana KaticSusan SullivanWhen an art dealer is gunned down in his gallery, Castle & Beckett discover that a bullet is inexplicably missing from the crime scene. The mystery is deepened by an amnesiac who witnessed the crime but can't remember what he saw or even who he is.
- DirectorBryan SpicerStarsNathan FillionStana KaticSusan SullivanA death of a bridesmaid reunites Castle with his long lost love.
- DirectorThomas J. WrightStarsNathan FillionStana KaticSusan SullivanWhile investigating the death of an Irish mobster, Beckett and Castle uncover a local turf war that may be connected to both a late-night infomercial guru and an international drug smuggling operation. But the case turns agonizingly personal when evidence emerges that the killer they're chasing may have had a hand in Beckett's mother's murder.
- DirectorRosemary RodriguezStarsNathan FillionStana KaticSusan SullivanMysteries abound when a family returns from vacation to discover a dead man in their daughter's bed. Thinking they're investigating the murder of a squatter, Castle and Beckett soon find themselves unraveling a multi-million dollar heist. Meanwhile, Castle tries to keep Beckett from finding out that they've been romantically linked when he's featured as one of New York's 10 most eligible bachelors.
- DirectorDavid BarrettStarsNathan FillionStana KaticSusan SullivanA baseball player is found dead in Spanish Harlem. It's found that he had many people hating him because he went to Cuba and shook hands with Castro.
- DirectorThomas J. WrightStarsNathan FillionStana KaticSusan SullivanA naked woman is found bound and hanging from monkey bars. Castle and Beckett look into the world of dominatrix.
- DirectorBryan SpicerStarsNathan FillionStana KaticSusan SullivanIn a two-part storyline, Federal Agent Jordan Shaw, an insightful and accomplished Federal investigator, teams up with Castle & Beckett to hunt down a cunning and elusive serial killer.
- DirectorJohn TerleskyStarsNathan FillionStana KaticSusan SullivanThe serial killer remains at large and is taunting Castle, Beckett and Jordan Shaw to catch him.
- DirectorBill RoeStarsNathan FillionStana KaticSusan SullivanThe investigation into the shocking death of a museum curator, crushed by a falling gargoyle, takes a bizarre turn when Castle and Beckett learn that he isn't the first member of a recent archeological expedition to die. It turns out there was a legend inscribed over the burial chamber the team unearthed warning that "all who gaze upon the face of the mummy are doomed." Was the curator just the latest victim of "The Mummy's Curse"? And if so, what does that mean for Castle, who snuck a peek at the mummy when no one was looking?
- DirectorBryan SpicerStarsNathan FillionStana KaticSusan SullivanWhen a talk show host tells Castle someone wants him dead and dies the next day, Castle asks Lanie to prove his death was a homicide.
- DirectorJohn TerleskyStarsNathan FillionStana KaticSusan SullivanWhen an ex-con is tortured to death, Castle and Beckett reveal a shocking connection between a suspect and Esposito's former partner, who presumably died.
- DirectorRon UnderwoodStarsNathan FillionStana KaticSusan SullivanThe death of a popular chef reunites Beckett with her high school best friend who owns the restaurant the chef worked at.
- DirectorJohn TerleskyStarsNathan FillionStana KaticSusan SullivanBeckett asks Demming to join their robbery-homicide case causing Castle to want to solve the case first.
- DirectorRob BowmanStarsNathan FillionStana KaticSusan SullivanNothing is as it seems when Castle and Beckett investigate what appears to be the assassination of an intelligence operative. Meanwhile, Beckett's romance with Demming threatens her relationship with Castle, forcing them to confront their feelings for each other.
- DirectorRob BowmanStarsNathan FillionStana KaticSusan SullivanBeckett hasn't heard from Castle since he left for the Hamptons months ago to finish writing his second Nikki Heat novel, "Naked Heat." The most Beckett, Ryan and Esposito have seen of Castle is a bookstore standee of him advertising an upcoming book signing. So when Beckett and her team burst into a shadowy apartment on the trail of a murderer, the last thing they expect to see is the real-life Castle standing over a dead woman's body holding a gun. As Castle protests his innocence, Beckett has no choice but to arrest him on suspicion of murder.
- DirectorJohn TerleskyStarsNathan FillionStana KaticSusan SullivanWhen a famous psychic is murdered, Beckett and Castle search for her killer while also carrying on a spirited debate on the existence of extrasensory abilities. Evidence mounts on both sides, especially when a letter arrives from the victim, penned the day she was killed and predicting her own death -- or was it written by a clever killer, hoping to throw off the investigation?
- DirectorBryan SpicerStarsNathan FillionStana KaticSusan SullivanWhen a coded document hidden by a murdered bail bondsman gets Castle's imagination running wild, Beckett must steer the case back to the violent felons who populated their victim's world - only to discover that maybe Castle's crazy theories aren't so crazy after all. Complicating matters is the surprise arrival of Beckett's ex-partner (now a bounty hunter). As the two reunite over a history that Castle has no part of, Castle is forced to watch the relationship take a turn towards the romantic.
- DirectorRob BowmanStarsNathan FillionStana KaticSusan SullivanWhen a mathematician is killed by a 200-year-old bullet, Castle comes up with time-traveling theories.
- DirectorJohn TerleskyStarsNathan FillionStana KaticSusan SullivanMysteries abound when pallbearers at a funeral lose control of a surprisingly heavy casket only to have a second unknown woman tumble out along with the original deceased. When Castle and Beckett learn that the victim was a doctor at County Hospital, their investigation takes them into the world of amorous, bed-hopping physicians. Did jealousy turn to murder, or did the doctor's mysterious work outside the hospital lead to her demise? Meanwhile, Castle's relationship with Gina is challenged when she tries to bond with Alexis.
- DirectorBill RoeStarsNathan FillionStana KaticSusan SullivanWhen a beautiful woman is found dead in an alley, all clues point to her being a victim of the notorious Triple Killer. The Triple Killer, or 3XK, terrorized New York City four years ago, then mysteriously disappeared. Now he's back. In a deadly battle of wits, Castle and Beckett race against time to stop 3XK before he claims his next victims.
- DirectorFélix Enríquez AlcaláStarsNathan FillionStana KaticSusan SullivanResponding to an "Officer Down" emergency call, Castle and Beckett's latest case takes a shocking turn when it's revealed that the victim isn't a cop but a male stripper dressed up as one. The murder leads them into the world of male strip clubs, the hardships of struggling actors, and the price that people pay in pursuit of fame. Did our victim's dreams of stardom get him killed, or was there something more nefarious afoot?
- DirectorBryan SpicerStarsNathan FillionStana KaticSusan SullivanA subway worker is found dead after witnessing the kidnapping of a twelve-year-old boy.
- 2009–201643mTV-PG8.3 (1.4K)TV EpisodeDirectorBethany RooneyStarsNathan FillionStana KaticSusan SullivanAstrophysicist Marie Subbarao (35)'s corpse is found, with all symptoms of fatal explosive decompression. Her ex Ted Carter, a colleague at the institute, has an alibi. An SF author friend also points to Castle's remark that everything seems to point to aliens. However the team's digging leads to FBI agent Westfield, whose agency goes to extraordinary lengths to stop their investigation, yet fails to keep from them Chinese Ung Kyu's involvement.
- DirectorBryan SpicerStarsNathan FillionStana KaticSusan SullivanThe death of a bar owner takes Castle and Beckett back in time to the prohibition era.
- DirectorJeff BlecknerStarsNathan FillionStana KaticSusan SullivanAn actress playing Nikki Heat shadows Castle and Beckett on the death of a matchmaker. Meanwhile, Ryan plans on proposing to Jenny.
- DirectorMillicent SheltonStarsNathan FillionStana KaticSusan SullivanWhen the owner of historic Drake's Magic Shop in New York is found drowned in Houdini's famous water torture tank, Castle and Beckett must delve into the world of magic, magicians and their secrets to find his killer. As part of their investigation, Castle & Beckett meet master magician Tobias Strange. Meanwhile, the magicians aren't the only ones keeping secrets, as a new romantic relationship is revealed for Esposito and Lanie.
- DirectorThomas J. WrightStarsNathan FillionStana KaticSusan SullivanThe detective on Beckett's mother's homicide case is killed after telling her he has information.
- DirectorEmile B. LevisettiStarsNathan FillionStana KaticSusan SullivanLottery-multimillionaire Jay Hixton is shot in the heart at home around midnight. He was apparently forced to open his safe. It contained a gun even butler Reginald Easley didn't know about, which was laid besides him, and a bag, which was taken, containing $100,000 cash and a blue dye bomb, which exploded in a maintenance worker's face. Various suspects arise from Hixton's bizarre generosity, his own murky past and his family, an ex and junkie daughter, and even his winning lottery ticket a year ago.
- DirectorJohn TerleskyStarsNathan FillionStana KaticSusan SullivanCastle fights to help an old boarding school friend when be is accused of killing his wife.
- DirectorRob BowmanStarsNathan FillionStana KaticSusan SullivanRecent US citizen Amir Alhabi, an immigrant from Syria, is found dead in a building next to where his stripped cab is found. He and his cousin Jamal were the owners of the cab. Investigation of the cab's GPS shows that Amir picked up a fare earlier in the day, drove in a circle and then let him out at the same spot. The fare is identified as Fariq Yusef, a 'security attache' for the Syrian Embassy. When Castle and Beckett go to investigate a storage locker, identified from a note on Amir's phone, they find a weapons cache and are exposed to radioactive Cobalt 60. Homeland Security Agent Mark Fallon takes charge as Amir used to work in the Syrian weapons program and it is feared he created a nuclear weapon. Suspecting something didn't feel right, Castle, with Beckett's help, contacts Fariq Yusef to get more information. When Agent Fallon finds out, they are both removed from the precinct. Unofficially, they keep looking into tracing a payment to Amir and why he had a camera installed in his cab. This leads to a fake cover-up, shifting focus to cab driver Kevin McCann.
- DirectorBill RoeStarsNathan FillionStana KaticSusan SullivanWith time running out, Castle and Beckett must put aside their differences with Agent Fallon to avert a city-wide catastrophe.
- DirectorDavid BarrettStarsNathan FillionStana KaticSusan SullivanA writer of a popular soap opera is found dead. Castle and Beckett come across cheating husbands, mistresses, backstabbers and a con artist to find the killer.
- DirectorJeff BlecknerStarsNathan FillionStana KaticSusan SullivanJuror #7 Joe McUsic, who runs a halfway house, drops dead of cyanide-poisoning during Otis Williams's high-profile trial for the murder of heiress Lyla Addison. Juror #4 Tony Mueller runs as he believed Otis's cousin, Wardell, poisoned Joe and he'd be next. Wardell claims he is being framed just as the cops are trying to frame Otis. The cyanide came not from the court house vending machine coffee but was released from a capsule. The plot thickens when it was found that Joe McUsic used a bribe to be put into the jury pool. The case is complicated as there doesn't appear to be any link between Joe McUsic, Otis Williams or Lyla Addison.
- DirectorSteve BoyumStarsNathan FillionStana KaticSusan SullivanCastle knows of four pizzerias named "Nick," with various combinations of the predicates terrific and/or authentic. But their owners, bitter rivals, continually sabotage each other with frat pranks. Then a corpse is found in the pizzeria oven, crisped, but killed by previous stabbing. The owner accuses his rivals, but no one is innocent and everyone has a dirty secret. And the victim, a former war correspondent who lost his edge after his daughter died in a car accident, was reporting on them about their "pizza wars." However, he'd also stumbled across the identity of 'urban myth' Cavallo, a drug lord who viciously executes rivals.
- DirectorPaul HolahanStarsNathan FillionStana KaticSusan SullivanWhen a champion swimmer and Olympic hopeful is found dead in a training pool, Castle and Beckett dive in to investigate his murder, and uncover myriad secrets that might have led to his death.
- DirectorJohn TerleskyStarsNathan FillionStana KaticSusan SullivanWhen Beckett's old training officer is killed, she takes off on a solo mission to find the killer. On the plane she runs into Castle who is flying out to the Heat Wave movie set. She lets him help her catch the killer.
- DirectorJeff BlecknerStarsNathan FillionStana KaticSusan SullivanMysterious murder occurs during a beauty pageant and the suspects are plentiful.
- DirectorRob BowmanStarsNathan FillionStana KaticSusan SullivanCop killer Hal Lockwood, whom Beckett visited unsuccessfully in jail for months hoping for a lead in her mother Johanna's closed murder case, is released by a faked order into the general population, where he slices rogue cop Gary McCallister's throat, then is helped by fake cops to escape. Beckett, his likely next target, receives warnings from her father, Montgomery and Castle. Much helped by Ryan and Esposito, the duo work out that there must be a police accomplice and/or mastermind controlling Chuck Ryker, the debt-ridden corrupt jailer who was found murdered at his home.
- DirectorRob BowmanStarsNathan FillionStana KaticSusan SullivanBeckett fights for her life after her shooting while the 12th precinct gets a new tough captain, Victoria Gates.
- DirectorJeff BlecknerStarsNathan FillionStana KaticSusan SullivanSex offender ex-con Tyler Faris is found in an alley, cut in half by a sword. Faris' victim claims that a man in a superhero uniform saved her. Even Castle doesn't recognize the uniform, which is eventually identified as Lone Vengeance, the hero of an Internet site authored by Sean Elt, a pseudonym. Actually, several people prance around New York in Lone Vengeance suits. The team investigates them and Tyler's enemies, such as his former employer Tony 'The Butcher' Valtini, thus proving to Captain Victoria Gates her lack of confidence in them is unwarranted.
- DirectorHolly DaleStarsNathan FillionStana KaticSusan SullivanGunshots, a fleeing van and a massive blood pool all point to murder, but when Castle & Beckett arrive at the crime scene, they discover that it lacks something - the victim! The investigation leads to the cutting-edge world of life-extension science, a cunning high-tech researcher, and a sleazy porn mogul who invested in a modern-day "fountain of youth." Meanwhile, Alexis finds out whether she got into Stanford.
- DirectorRob BowmanStarsNathan FillionStana KaticSusan SullivanStudent Jane Herzfeld was fatally shot with the Glock service pistol stolen from Detective Ryan by serial killer 3XK. Her ex-boyfriend, Finn McQueen, has an alibi. Phone records show she was in contact with undercover narcotics Detective Seth Carver. He had forced her to inform on Chinese mob boss Clifford Lee by acting as a tutor to his son, Ben. Castle ingeniously finds some missing links through prison records.
- DirectorJohn TerleskyStarsNathan FillionStana KaticSusan SullivanJealousy arises when an insurance investigator helps the team.
- DirectorBill RoeStarsNathan FillionStana KaticSusan SullivanCastle and Beckett confront the possibility of paranormal foul play when a world-renowned ghost hunter is mysteriously murdered while investigating a haunting at a legendary New York mansion.
- DirectorBryan SpicerStarsNathan FillionStana KaticSusan SullivanCastle and Martha are held hostage during a bank robbery and Beckett has to try to get them and the other hostages out.
- DirectorBill RoeStarsNathan FillionStana KaticSusan SullivanA hotel-casino co-owner from Jersey is found murdered. The boys go to Atlantic City to investigate "and have Ryan's Bachelor party", while Beckett stays in New York.
- DirectorDavid BarrettStarsNathan FillionStana KaticSusan SullivanA case involving a sniper brings back memories for Beckett of her own shooting.
- DirectorJohn TerleskyStarsNathan FillionStana KaticSusan SullivanCastle and Beckett wake up handcuffed together in a locked room with no memory of how they got there. Their colleagues try to retrace their steps and find them.
- DirectorJeff BlecknerStarsNathan FillionStana KaticSusan SullivanWhen a Lothario is killed, Castle and Beckett suspect that the victim's mysterious double life holds the key to his murder. Their investigation leads to a shocking twist that threatens to disrupt Ryan's wedding with Jenny.
- DirectorKate WoodsStarsNathan FillionStana KaticSusan SullivanWhen a woman is found murdered in her car, Beckett and her team's investigation leads them directly to City Hall... specifically to the Mayor, Robert Weldon, who happens to be a friend of Castle's, which could also jeopardize Castle's continued involvement with the NYPD.
- DirectorThomas J. WrightStarsNathan FillionStana KaticSusan SullivanDog trainer Francisco Pilar is murdered after naming Best of Show at a dog show. Castle gets the Labrador he was training temporarily adopted as team mascot, and his nose proves quite useful. Airhead reality TV star Kay Cappuccio, seen leaving Pilar's room, has a motive, but was he or she spied on by the camera planted in the dog's collar. And why is there a customs undercover agent?
- DirectorChuck BowmanStarsNathan FillionStana KaticSusan SullivanCastle senses a diary of a P.I from the 1940s found in the effects of a murdered modern-day treasure hunter is the key to finding the Blue Butterfly, a blue-diamond necklace. The team works out the story situated in 1947 in the same, now derelict, music club, involving murder, gangsters, and theft; they work out the true parts and identities of culprits and victims.
- DirectorBryan SpicerStarsNathan FillionStana KaticSusan SullivanThe department's reputation is damaged after a convicted murderer escapes custody and steals all the evidence the police have on him, and Castle and Beckett must team up with the CIA to catch him before he kills again.
- DirectorRob BowmanStarsNathan FillionStana KaticSusan SullivanCastle and Beckett race to find the "Linchpin" in order to stop the first domino in a chain of events which will plunge the United States into war.
- DirectorJeff BlecknerStarsNathan FillionStana KaticSusan SullivanWomen are found dead, dressed as fairytale characters. An event years ago that led to a death connects all three women.
- DirectorKevin HooksStarsNathan FillionStana KaticSusan SullivanDuring recording of TV show "A Night of Dance", spoiled-rotten rich girl Odette Morton, who made it to the semi-final, is murdered in her easily accessible dressing room. Suspects include a previously knocked-out candidate who is now automatically restored, the presenter and someone he had a secret with. But evidence shows Odette's has a big secret of her own that she recently shared with some people from her past, which includes another murder.
- DirectorPaul HolahanStarsNathan FillionStana KaticSusan SullivanThe FBI commandeers the NYPD detectives for little more than leg work after a bomb explodes during an anti-globalist demonstration. Castle is asked by Captain Gates to help out by using his speed-reading ability and attention to detail to sifting through mountains of witness depositions. This helps the 12th precinct team get on the right track after the FBI concentrates on the wrong suspect.
- DirectorBill RoeStarsNathan FillionStana KaticSusan SullivanA devilishly handsome detective from Scotland Yard teams up with Castle and Beckett to find the person responsible for the murder of his friend's daughter. Also, Castle and Beckett suspect Nigel, the Deputy General at the British Consulate, is up to more than just ambassadorial balls and diplomatic luncheons. Meanwhile, Lanie convinces Beckett that she needs to make a move on Castle before it is too late.
- DirectorJohn TerleskyStarsNathan FillionStana KaticSusan SullivanCastle finally gets Beckett, who admits so only in therapy, she may have made him wait too long when he teams up for an investigation with her colorful colleague detective inspector Ethan Slaughter, a cowboy style bulldog, who was assigned multiple decapitated Jamaican corpses from the Irish Westies gang member Brian Reilly's maverick son. Although uncomfortable with the ruffian style, gentleman sleuth Castle proves his value while they discard a simple gang war and focus on newcomer Cesar Vales's Mexican gang. Castle not only repeatedly appeals to his former team, but actually turns to them when he disagrees with Slaughter's theory as well as his bully blackmail method.
- DirectorBill RoeStarsNathan FillionStana KaticSusan SullivanCastle and Beckett investigate the murder of a man covered in human bite marks apparently caused by a Zombie attack.
- DirectorRob BowmanStarsNathan FillionStana KaticSusan SullivanThe murder of a Latino army veteran ex-con, ex-Lobos-street gang member quickly links to a break-in in the late captain's home, to steal only and all his old police files, and yields the fingerprints of the sniper who nearly killed Beckett. Castle realizes continuing the investigation will draw him back and probably cost her life by squashing his deal with deep throat. Her refusal to back down causes a break up with Castle, and Gates suspends both her and Esposito for continuing an unauthorized investigation in a case assigned to another NYPD team. Now Beckett commits romantically.
- DirectorRob BowmanStarsNathan FillionStana KaticSusan SullivanCastle and Beckett re-evaluate their relationship after spending the night together.
- DirectorKate WoodsStarsNathan FillionStana KaticSusan SullivanBeckett returns from her suspension while she and Castle keep their relationship hidden.
- DirectorJohn TerleskyStarsNathan FillionStana KaticSusan SullivanWendy Dupree, murdered in a cheap motel, wrote a clue in her blood. When Castle realizes it's no word but a number, it leads, in combination with her phone records, to a storage compartment, about to be auctioned, rented by her brother Wendell, an ex-con, who died in a suspicious accident a few months earlier. He was employed as driver by socialite Anjelica Henley, who recently reported a super-valuable diamond, stolen in a robbery, focus of further criminal intrigues. The earlier past provides the crucial clues, while Castle and his mother worry about Alexis's impending moving out to a dorm, albeit in New York.
- DirectorRob BowmanStarsNathan FillionStana KaticSusan SullivanCastle and Beckett's romantic weekend in the Hamptons turns sour when a dying man stumbles into Castle's pool.
- DirectorJohn TerleskyStarsNathan FillionStana KaticSusan SullivanAfter Tessa Horton is murdered in a bizarre fashion at her apartment, evidence piles up, all pointing at Castle. He denies knowing her, let alone having had an affair, but there are fingerprints, security footage and recovered hard-drive evidence all showing he did. Although no one in the precinct can believe him guilty, they must arrest him based on the evidence. Only then does vindictive serial killer Jerry Tyson manifest himself to Castle while he is in Holding at the precinct, promising that he won't survive jail, which calls for a radical solution.
- DirectorJonathan FrakesStarsNathan FillionStana KaticSusan SullivanDuring the annual major science fiction convention, Nebula 9 - super-fan Audrey O'Neill, who finally organized a life performance starring the short-lived series' original cast as well after decade of 'webipsodes' with a nerd couple, is found dead on set, killed with a real 'space laser' (of which only two working ones were custom-made). Castle, who thinks he has better taste, is amused to find Becket was part of a college fan group. The team works out various personal, career and business motives as well as opportunities for cast and crew.
- DirectorDavid BarrettStarsNathan FillionStana KaticSusan SullivanA documentary crew follows Castle, Beckett and the team as they investigate the murder of a rock band's lead guitarist.
- DirectorDavid BarrettStarsNathan FillionStana KaticSusan SullivanWhen Beckett and Castle pick up a witness to a murder, hired killers attack, and they lose their cell phones and Beckett's gun. They run for protection while Esposito and Ryan try to find them.
- DirectorPaul HolahanStarsNathan FillionStana KaticSusan SullivanA man dressed as Santa falls from the sky while Castle and Beckett prepare for their first Christmas as a couple.
- DirectorHolly DaleStarsNathan FillionStana KaticSusan SullivanA divorce lawyer is found dead. Meredith visits to take care of a sick Alexis while Beckett is staying there due to her apartment being fumigated.
- DirectorJohn TerleskyStarsNathan FillionStana KaticSusan SullivanA promising DJ is murdered at an album-release party for a pop star which takes Castle and Beckett inside the drama of NYC's music industry
- DirectorBill RoeStarsNathan FillionStana KaticSusan SullivanSoft porn tycoon Beau Randolph was strangled with a bra during a grand party to launch another College Girls Gone Crazy franchise production. He received many death threats, such as from arch-conservative Ronald Armstrong's grim prudish movement. Beau's own bodyguard Scarlet Jones, whom Javier finds irresistible, stole a memory card from his safe and was hired by children's TV production firm. Actress Tiffany Shaw also lies a lot about her disguised party presence, which is only the top of an iceberg of family and business secrets.
- DirectorThomas J. WrightStarsNathan FillionStana KaticSusan SullivanThe victim's corpse is found burning in a barrel by a homeless man. The team finds out she worked for US Senator William H. Bracken, whom Beckett holds responsible for her mother's murder. But he seems to be the target, this time. Only Castle learns that Beckett considered holding back evidence before another clue leads the team to prime suspect Robert McManus, a mechanic who blames the senator for his son's suicide. The senator is hell-bent on holding a high-profile speech in a hotel to launch a career-crucial environmental bill.
- DirectorLarry ShawStarsNathan FillionStana KaticSusan SullivanHannah Green, star of a reality show, is found dead at a bus stop with a knife in her back. She has bruises from being held captive for the day she went missing from the studio. The team unravels complex rivalries for parts, infidelity and spin-offs that affect both a clothing line and Margo's son Stone Gower's series project with co-star Collette's daughter, Ashley. Castle and Becket fear the captain will discover their affair after he accidentally drops Beckett's Valentine present in the wrong coat.
- DirectorBill RoeStarsNathan FillionStana KaticSusan SullivanHasim Farouk, a student at Columbia like Alexis, is killed by a van crashing into him while he emptied his gun into it. The team soon works out the van was used to kidnap not only Egyptian tycoon Anwar El-Masri's daughter Sara, but also Alexis, whom she attended a lecture with. FBI agent Harris' sole lead, obtained from Castle torturing the wounded van driver, runs into a dead-end. Meanwhile, the girls attempt an escape, but discover they are not where they thought they were.
- DirectorRob BowmanStarsNathan FillionStana KaticSusan SullivanAfter the FBI fails to get Alexis back, Castle takes matters into his own hands.
- DirectorRon UnderwoodStarsNathan FillionStana KaticSusan SullivanCastle is shaky after watching a DVD which predicts, in flashy amateur horror style, the exact time of death, for no apparent reason and probably by panic-caused cardiac arrest, of the murder victim, screaming in the phone, who received it. Her ex has a solid alibi and couldn't make sense of her panic about 'it'. Tracing the DVD's shipping leads to another copy recipient, killed at home similarly. Their only link is having been jurors on executed country serial killer Nigel Malloy's trial. The team heads for his home town, loved-ones and surviving jurors.
- DirectorRob HardyStarsNathan FillionStana KaticSusan SullivanThe corpse of Jimmy, a baker popular for cup cakes, is found in his industrial dough mixer. His apprentice, Todd, noticed someone in a vintage muscle car, before being sent away. The car was identified as belonging to Irish mob boss Robert 'Bobby S.' Shannon. After FBI agent Sam Walker tells the team that Jimmy was his informant, Ryan astounds everyone by revealing he had been undercover in that gang years ago. And, to save a friend, chooses to revive his alias, Fenton, and go back undercover.