While trying to navigate the everyday drama of high school, the smart, fearless, 17-year-old Veronica Mars also moonlights as an apprentice private investigator out to solve her wealthy town of Neptune's toughest mysteries. After coming to the aid of the new kid, sophomore Wallace Fennel, who's been duct-taped to the school's flagpole, Veronica ends up incurring the wrath of the thugs who put him there, Eli "Weevil" Navarro and his P.C.H. Biker Boyz. To get Weevil and his gang off her and Wallace's case, Veronica devises an intricate plan that helps some of Weevil's cronies avoid trouble with the law.
Meanwhile, defying her father, Keith Mars, the disgraced former sheriff turned private eye, Veronica pursues a late-night case of adultery against billionaire Jake Kane, only to make an unsettling discovery about her mother, who abandoned Veronica and Keith a year ago.

Veronica doesn't believe the evidence adds up against Weevil, who has confessed to stealing credit card applications from Logan's family, and launches an investigation to help her new ally.
Meanwhile, after joining Ms. Mallory Dent's newspaper class, Veronica clashes with socialite Caitlin Ford, Logan's bombshell girlfriend, but is intrigued by the attention shown to her by another wealthy student, Troy Vandegraff, a friend of ex-boyfriend Duncan. Later, Veronica learns that Lilly got a ticket driving her car on the day she died - two hours after her supposed time of passing.

Even though it brings up her own painful and personal memories for her, Veronica agrees, with Wallace's help, to look for the father of her classmate Justin, who has been missing for 10 years. Veronica is also having a hard time dealing with conflicting feelings she is having concerning past and present loves. Keith is called to the school by the guidance counselor who is concerned about how Veronica is handling all the changes that she has been forced to deal with lately. One of the issues that Veronica and Duncan have in common is dealing with is the upcoming anniversary of Lilly's passing.

In an effort to help Wallace's new crush Georgia, who was duped out of her money in an internet scheme, Veronica must outwit a group of computer "thugs", known as the Silicon Mafia.
Meanwhile, Keith makes Veronica introduce him to her new boyfriend Troy before allowing her to go to the homecoming dance with him. Later, Logan helps Duncan edit together a memorial video for a school dedication ceremony marking the one-year anniversary of Lilly's passing. The dance and the video bring back Veronica's memories of when the four of them were friends.

Veronica tries to help her new boyfriend Troy find his father's stolen car and turns to Weevil for assistance, but the situation becomes dangerous when she discovers that Logan and Troy's buddy Luke might have left more than a piata in the car after their night out in Tijuana.
While Keith has accepted that his wife is gone and begins dating school guidance counselor Rebecca James, Veronica continues to secretly investigate her mother's whereabouts, leading her to stumble on a secret Lianne Mars was keeping.

Veronica investigates possible fraud in the election of student council president at school after Duncan wins, beating a more popular, but less affluent student who promised to eliminate the wealthy students' on-campus perks.
Meanwhile, Logan causes a public relations nightmare for his movie star parents Aaron and Lynn Echolls when footage of him organizing boxing matches between homeless men is posted on the internet and leaked to the media. Later, Veronica and Keith learn that the man who admitted to cuddleing Lilly is set to be executed, but a second look at crime scene photographs puts his confession in question.

Veronica becomes suspicious when a young pregnant woman who lives in their apartment complex with her volatile boyfriend suddenly disappears; fearing the worst, Keith steps in to help his daughter investigate this case for the girl's estranged parents.
Meanwhile, Logan and Weevil get thrown into detention together after arguing with a teacher, leading the rivals to discover some surprising things in common. Later, while working on an alumni photo project in her journalism class, Veronica is shocked to discover in the '79 yearbook that her mother and Jake Kane were high-school sweethearts.

To help restore a cheerleader's ruined reputation, Veronica turns to funky computer geek Mac to find the hacker responsible for leaking the embarrassing, private results of a popular online "purity test" to all of Neptune High.
Meanwhile, Keith helps Wallace and his mom with an unruly tenant in their building. Later, to get answers about Lilly's cuddle, Veronica attempts to visit Lilly's confessed, condemned hugger Abel Koontz in prison.

The wealthy parents of a Neptune High senior hire Keith and Veronica to investigate a cult-like group and its charismatic leader after their son Casey moves out to live on the collective farm.
Meanwhile, Veronica attempts to get to the bottom of Abel Koontz' claim that her real father is Jake Kane.

Lynn Echolls hires Keith to investigate a threatening letter sent to Aaron. He must track down the woman who sent the letter and stop her from coming to the Echolls Family's annual Christmas party.

Someone steals Weevil's winnings in a poker game with the 09ers, and he starts stealing stuff that belongs to them. They ask Veronica to help find out who stole the money so that they will get their stuff back.

Veronica uncovers information that her fellow outcast Mac was switched at birth with a more affluent student, causing Veronica to examine her own questions about whom her real father may be.
Meanwhile, a serial hugger has resurfaced in Neptune forcing Sheriff Lamb to forge a reluctant, tense partnership with Keith. Later, Veronica flirts with a handsome young rookie at the sheriff's department to obtain more information on Lilly's cuddle.

When a family accuses Veronica of providing a fake ID to their son, now in an alcohol-induced coma, and files suit, the search to find who's really responsible leads Veronica to a clandestine, exclusive organization operating on Neptune High's campus with a possible connection to Duncan.
Meanwhile, Aaron Echolls hires Keith to find out who's been supplying pictures to the tabloids that have humiliated his wife Lynn. Later, Veronica bugs Ms. James' office to eavesdrop on grief counseling sessions, and learns some surprising information about her friends.

After being hired by hip-hop heavyweight Percy "Bone" Hamilton to find his kidnapped daughter, Veronica and Keith look to the music mogul's long list of enemies, family members and the girl's Neptune High social circle for clues on her whereabouts.
Meanwhile, following Lynn Echolls' apparent sleeping, Logan cynically endures his father Aaron's effusive displays of grief as they prepare for her memorial ceremony.

When one of Neptune High's haughtier students brings a sexual harassment suit against a favorite teacher, Veronica finds herself pitted against her father when the girl's parents hire Keith to help in their case.
Meanwhile, with the tabloids claiming his mom is still alive, Logan turns to Veronica to help him track down the truth. Later, Veronica discovers more unsettling information about Duncan's hidden medical condition.

Meg asks Veronica to help her find herself secret admirer. Veronica finds herself working a love when she is also asked to track a Russian bride's estranged fiancé. Logan gets a rush of hope that his mother may still be alive after finding that one of her credit cards has been being used, leading Veronica and Logan to a Los Angeles hotel in hopes of finding her or a clue.

After the apparent kidnapping of Neptune High's beloved mascot, Polly the Parrot, Veronica is hired to track her down and get her back. Her detective work leads her to go undercover at a rival school on the eve of a big basketball game. Veronica has an emotional reunion with her mother who she has not seen sense her mother left the family the year before. When Veronica's suspicions about the Kane family are renewed Veronica attempts to get her hands on her father's original interrogation tapes of Lilly's cuddle. Veronica's love life also seems to be getting renewed as Veronica's relationship with Deputy Leo heats up.

When it becomes obvious that someone is trying to distract Valedictorian hopeful Sabrina, from being able to achieve this honor by distracting her from her studies and wrecking her grades, Veronica sets out to investigate who the culprit could be. Keith receives a business proposition from an unlikely source and in the ongoing investigation into Lilly's cuddle Veronica tried to discredit Abel Koontz's confession. Things become awkward for Veronica and the few classmates she has as friends when Logan discovers the file that she is keeping on everyone that has anything to do with Lilly's cuddle.

A series of fire drills leads Veronica to discover that Neptune High has been receiving bomb threats, so she enlists Wallace and Mac's help to investigate classmates who could pose a serious threat to the school, including new student Ben.
Meanwhile, Keith stuns Veronica with the news of who he's been secretly dating. Later, Duncan confronts Veronica about her ongoing investigation into his sister's passing.

While helping her classmate Mandy search for her missing Jack Russell terrier, Veronica stumbles onto a bigger mystery, which affects pets all over Neptune.
Meanwhile, tensions mount in the Echolls family as Trina tries to convince the now-retired Aaron to take a part in her new boyfriend's independent movie. Later, Weevil is arrested for breaking into the Kane residence and taking something from Lilly's room.

When a classmate's boyfriend threatens to post a humiliating video of the girl online if she dumps him, Veronica helps her concoct a scheme to ensure "mutually assured destruction" if he doesn't allow the relationship to end peacefully.
Meanwhile, Keith begins to search for Duncan after his parents post a huge reward for information on his whereabouts. Later, as her secret new relationship heats up, Veronica learns a disturbing new fact about the night that she was drugged and assaulted.

Determined to get to the truth behind who drugged and assaulted her at a party the year before, Veronica questions her friends and many rivals about the chain of events that night at Shelley Pomroy's house.
Meanwhile, when one of Veronica and Wallace's stunts affects her job at Kane Software, Alicia confronts Keith about his daughter's behavior. Later, in an attempt to get closer to his son, Aaron throws a birthday party for Logan that inadvertently surprises everyone.

In some hair twisting turn of events Veronica must betray someone she cares deeply about in order to solve the season-long mystery of who cuddled her best friend Lilly Kane. But once she figures out who it is getting the person to confess or the police to believe her will put more people the just Veronica in danger.

Meanwhile, on the eve of a reception for the Governor of Calif., Jake Kane asks Duncan if he really wants to know what happened on the night Lilly died. Later, Keith awaits the results of a paternity test.