When the body of a seven-year-old child is found, the squad again begins to investigate convicted serial killer Lucas Biggs, believing that he molested and murdered the boy. While Biggs can detail every child he ever molested, he swears that he has no memory of this one. Further investigations show that there is another suspect, but before he can be picked up, someone picks him off.
The squad is at a loss on what to do with a violent homicide when Stabler's son points out that the event is straight out of a video game. Interviewing the game's creators leads them to a former employee, who then leads them (with a few other steps along the way) to a teenage couple who claim to be unable to distinguish fantasy from reality.
When the body of a teenager is found with her older cousin's I.D., Benson and Stabler investigate only to learn that that the teen had been part of a group who had 'hooked up' online. As their investigation intensified, they realized that the victim was the object of an older man's obsession, but before they can arrest him he also turns up dead.
When a wealthy couple is found dead in their home, Benson and Stabler soon realize that their deaths are connected to a drug smuggling ring. Eventually the road leads back to the same drug dealers who forced a former assistant district attorney into hiding, and Alex Cabot comes home to face her enemies.
Fourteen years ago, Stabler had a chance to arrest a man for kidnapping, rape and murder, but the man managed to get off. With the recent discovery of a murdered woman, Stabler has another chance at cracking the case. They can only hold the man for 24 hours, but are able to glean enough information during that time period to at least have a place to start. Cragen and Benson both worry that Stabler will let his hatred for the suspected child molester interfere with his ability to do his job.
After an 18-year-old girl is kidnapped, psychic Sebastian Ballentine comes forward claiming to have information on the killings. Stabler refuses to believe that Ballentine is a real psychic, and is convinced that the hints he is dropping about the case indicate he is somehow involved.
When Denise Eldridge finds her fifteen-year-old daughter Carrie in bed with twenty-one-year-old Justin, she immediately calls police to have Justin charged with statutory rape. Benson intercedes on behalf of Carrie, calling a children's rights lawyer to assist her, but when Denise turns up dead, Carrie and Justin both end up on the suspect list. Benson tries to get some help from Simone Bryce, but Bryce is obligated to protect her client.
After a young woman is found raped and murdered near a nightclub with five hundred dollars stuffed into her mouth, Benson and Stabler follow the fingerprint trail on the money to attorney Jason Whitaker, whose sole responsibility seems to be handling the trust for the wealthy Duvall family. Soon detectives are convinced that Gabriel Duvall is their rapist, but don't have quite enough evidence to put him away. Novak is working on both the case and a terrified former victim when she is brutally attacked in her office late at night.
After a young woman's baby is tossed out of a car, Benson and Stabler investigate to find out what happened, and after learning the young woman is addicted to prescription painkillers, their investigation leads them to an elderly woman named Jenny Rogers, who lives with her son Kevin and daughter-in-law Carol. The young woman finally identifies Carol Rogers as the person who sold her the drugs, but when detectives go to confront Carol, they find her body and are left trying to uncover who really killed Carol.
When the head of a woman is found with traces of semen on it, the detectives suspect they have a necrophiliac. But they learn that they're dealing with a black market organ ring. John learns that Amy Solway, a person they sent to prison is looking for a kidney. As are the parents of a young boy.
After the wife of a police officer claims her husband raped her, Benson and Stabler arrest the man and come close to believing his version of events when he attacks his captain. When another officer murders his wife and attempts to kill himself that same night, the whole force gets involved and soon realizes that the two men both recently returned home from Afghanistan, where they were given the drug Quinium, an anti-malarial. With the reluctant help of reporter Sherm Hempell and a base doctor with an attack of conscience, Novak takes on the U.S. army. Stabler has ...
When a girl is attacked, a young man is arrested. They later learn that he takes steroids which is what made him attack her. The guy turns out to be the son of a cop Stabler knows. The cop later attacks his son and it turns out he is also taking steroids. Stabler is forced to deal with issues involving his own father.
After the bones of a boy who disappeared in 1978 are found at a playground, a recovering Stabler teams up with Vizcarrando to determine the boy's identity, which leads them to a cold case involving four missing Puerto Rican boys whom were never found.
A hooker is alerted by noise from the neighboring hotel room, and finds there a badly manhandled girl, who later has a miscarriage. Then the girl's father shows up and the case starts getting more complicated every time the cops learn something new about it.
When a teenager and her younger sister end up in the hospital after a day at the park, detectives learn that both girls were abducted from New Orleans after Hurricane Katrina along with a third sister who is still missing. Despite the interference of a local reporter, Jackson Zane, detectives are able to catch the kidnapper, a known pedophile, and recover the girl, but when Alvin Dutch dies and the autopsy determines it was Anthrax, Benson puts everything on the line so that she can get the truth out there.