After setting up a new business helping classmates dig up dirt on their parents, Veronica uncovers a huge revelation about her friend Mac, which leaves her wondering if some things about your family are best left unknown. Meanwhile, Keith must team up with Sheriff Lamb to track down a serial killer in Neptune.
Veronica finds herself the target of a set-up when a secret underground society within Neptune High begins planting evidence to get her in trouble. Meanwhile, Veronica learns new information about Lilly's murder by eavesdropping on private conversations, and Aaron Echolls becomes concerned about his wife.
After a wealthy music producer's daughter goes missing, Veronica almost bites off more than she can chew in her attempt to find her old friend. Meanwhile, Logan finds it difficult to show the proper emotions at his mother's wake.
When a girl in school accuses Veronica's favorite teacher of sexual harassment, Veronica finds herself pitted against her father, who is hired by the girl's family to get him fired. Meanwhile, Logan enlists Veronica's help to track down his mother, who he believes is still alive.
As Valentine's Day approaches, Veronica finds herself working as a love detective, tracking down Meg's secret admirer and helping a Russian woman find her missing fiancé, both with unexpected results. Meanwhile, Logan's family troubles continue when he stakes out a hotel that he believes is hiding his mother.
Veronica is shocked when Van Clemmons hires her to track down the missing school mascot, Polly the Parrot, but is distracted by memories of her recent reunion with her mother. Meanwhile, Veronica digs deeper into the Lilly Kane case, using her new relationship to gain access to private information.
Veronica investigates who at school is doing everything possible to distract the valedictorian front runner from studying and wreck her grades in an obvious attempt to sabotage her. Meanwhile, an unsavory, rival private investigator makes Keith a business offer. Later, Veronica pursues a risky lead that could discredit Abel Koontz's confession, as Logan stumbles onto her detailed files on everyone connected to Lilly's murder.
After several fire drills and bomb threats rock Neptune High, Veronica looks to new student Ben as a possible suspect. Meanwhile, Veronica and Wallace are shocked to discover that their parents have been secretly dating, and Duncan finds out that Veronica has been spying on him.
When awkward classmate Mandy asks Veronica to help her find her missing dog, a much larger scheme is exposed as they follow the trail. Meanwhile, Logan's sister Trina begs her father to play a role in her new boyfriend's movie, while Logan suspects that Trina is hiding something.
Veronica helps her friend Carmen plot revenge on her clingy boyfriend, after he releases a scandalous tape of her over the Internet. Meanwhile, Keith decides to track down the missing Duncan in exchange for the huge Kane reward.
After obtaining a shocking new piece of information, Veronica is determined to get to the bottom of what happened the night she was drugged and raped, even if it means piecing together the fuzzy stories of every 09er at Neptune High. Meanwhile, Aaron throws a party for Logan, but inadvertently throws a wrench into Logan and Veronica's secret relationship.
In the shocking, action-packed first season finale, a determined Veronica must betray someone she cares deeply about in order to solve the mystery of who murdered her best friend Lilly, but what she discovers puts her life in serious danger. Meanwhile, Jake Kane asks Duncan if he really wants to know what happened on the night Lilly died, and Keith awaits the results of a paternity test.
Veronica spends the summer trying to become "normal" again, but finds it difficult when Wallace is kicked off the basketball team for testing positive for drugs. Meanwhile, Keith is finding it hard to cope with popularity after releasing his book on the Lilly Kane murder, Logan takes refuge from the paparazzi at Dick and Beaver's, and a field trip to the local sports arena has shocking consequences.
Veronica finds her life once again swirling out of control as she struggles to deal with the aftermath of the bus crash by helping the daughter of the bus driver rule out suicide. Meanwhile, new student Jackie gets the attention of Wallace, who does a little detective work of his own.
Beaver hires Veronica to investigate his stepmother, Kendall, who he believes is cheating on his dad and planning to clean him out, but both are shocked by what they discover. Meanwhile, Wallace begins dating Jackie, against Veronica's advice.
Veronica tries to get her mind off the bus crash by going undercover to help a wealthy woman who is determined to prove that her husband is cheating on her. Meanwhile, Keith asks Alicia about the mysterious man who recognized her in Chicago, and Weevil gives Veronica new information about the accident.
Despite the fact that she dislikes Jackie, Veronica helps her find out who stole her credit card by going on a local psychic TV show. Meanwhile, Wallace's world is turned upside-down when his real father returns home, and Veronica gets a huge piece of new evidence in the bus case.
Veronica is shocked when a dying Abel Koontz shows up asking for her help in finding his missing daughter before he dies. Meanwhile, Logan is reunited with his father when he his arrested for Felix's murder, and Keith waits for the results of the election.
Veronica goes undercover after Duncan comes to her with a plea to help him find out which one of the children Meg was babysitting was being mentally abused by their parents. Meanwhile, Dick, Beaver and Kendall are visited by their lawyer, who informs them of Big Dick's wishes.
Veronica helps Keith determine who is haunting a school bus crash victim's parents, who are currently embroiled in a suit against the school district. Meanwhile, after Logan asks for help fighting the murder charge against him, Veronica stumbles into a dangerous situation with the local Irish mob. Later, Weevil's leadership of the P.C.H. Bikers is put into question.
After finding her mother's old permanent record at school, Veronica wonders how well she knew her mother at all, and decides to investigate her mother's school friends. Meanwhile, Trina takes the role of director in the school play, and while she has a confrontation with Kendall, Veronica has one with Celeste.
Veronica's day goes from bad to worse as she is called for jury duty over a case involving two 09ers and a Hispanic woman, but finds that Neptune is even more divided than she thought. Meanwhile, Keith helps Lamb track down the missing sex tapes, the key piece of evidence in the Aaron Echolls trial.