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 death.

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 murdering 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 murder, Veronica attempts to visit Lilly's confessed, condemned killer Abel Koontz in prison.

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 killer 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 murder.

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.

In the shocking, action-packed season finale, a determined Veronica must betray someone she cares deeply about in order to solve the season-long mystery of who murdered her best friend Lilly Kane, but what she discovers puts her life in serious 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.

After tragedy strikes Neptune, Calif. and the local sheriff rushes to judgment, an emotional Veronica attempts to help a grieving family member rule out suicide as a contributing cause in the calamity. Meanwhile, Wallace offers to help transfer student Jackie Cook, the fiery, flirty daughter of professional baseball player Terrence Cook, track down the person who damaged her car in the school lot. Later, mayoral candidate Woody Goodman asks Keith to consider running for sheriff.

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.

Deciding to give Jackie the benefit of the doubt since she's dating Wallace, Veronica tries to help Jackie determine who stole her credit card, leading Veronica to appear on a psychic's community access show to pursue a lead. Meanwhile, Wallace confronts his mother Alicia about who his real father is. Later, Veronica learns of a voice mail recording from one of the students that died, made at the moment the bus crash.

With Aaron Echolls facing trial for Lilly's murder, the previously accused Abel Koontz appears to enlist Veronica's help in finding his missing daughter Amelia, leading to a confrontation with Kane Software's head of security. Meanwhile, Logan is arrested

Called to jury duty over Christmas break, Veronica must sit on a difficult, polarizing case against a pair of affluent 09'er defendants accused of assaulting a young Hispanic woman. Meanwhile, when the Aaron Echolls/Lilly Kane sex tapes go missing from th

When Duncan disappears with Meg's baby, Lamb must work with two FBI agents to extract as much information as possible from an uncooperative Veronica. Meanwhile, Wallace reveals the real reason he returned to Neptune, and Weevil and Logan make a breakthrough in their hunt for the rogue gang member.

When a private website for Neptune High's gay students is hacked, and the members blackmailed, Veronica finds it difficult to track down the culprit when the victims want to remain anonymous. Meanwhile, Hannah finds out Logan's true intentions, and Keith believes he has found an alibi for Terrence.

Overcome with guilt and frustration, Weevil asks Veronica for help to bring Felix's true killer to justice, but realizes he may have to take matters into his own hands.Meanwhile, Keith reviews a strange DVD that Woody receives in the mail, and relationship troubles brew between Wallace and Jane, and Mac and Cassidy.

Veronica takes the stand in Aaron Echolls's murder trial, and is distracted during final exams while waiting for the verdict. Meanwhile, Keith takes new evidence about the mayor to Lamb, and Weevil asks Mac and Cassidy for help to pass algebra.

Veronica begins college with Logan, Wallace and Mac, but is immediately drawn back into old detective habits when Piz, Wallace's new roommate, gets all his stuff stolen. Meanwhile, Keith helps reunite Kendall with an old love, recently released from prison.

When the illegal casino Veronica frequents is robbed, she must track down the thief to recover the necklace Lilly gave her years before. Meanwhile, Dean O'Dell's stepson is dying of cancer and needs Keith to track down his biological father for a transplant (with Cliff's help), and Wallace fears he may flunk out of his most important class.

Keith and Veronica are hired to help find the missing grand-daughter of the founder of Hearst College, whose swing vote could spell the end of fraternities and sororities at Hearst. Meanwhile, Logan fears for Veronica's safety as she gets closer to the truth regarding the campus rapes.

After the campus rapist anonymously announces the location of his next rape, Veronica hires her friends to help her track him down, but is shocked when she discovers the rapist's identity. Meanwhile, Logan makes a drastic decision about his future with Veronica, and Dean O'Dell hires Keith to prove that his wife is unfaithful.

Veronica and Mac help campus researchers locate a missing monkey who was allegedly stolen by animal rights activists. Meanwhile, Keith is approached by Mindy O'Dell, who claims her husband's death was murder, not suicide. And in the aftermath of his breakup with Veronica, Logan turns to Dick for advice.

Veronica is hired to track down a one-night-stand, but the situation becomes more complicated when she turns out to be a hooker. Meanwhile, Keith continues his investigation in Dean O'Dell's death, and a visit by Madison Sinclair causes trouble for Veronica and Logan.

Keith takes on a second concurrent murder case when the head of the Hearst basketball team turns up dead and his son is the prime suspect. Meanwhile, a depressed Logan refuses to leave his hotel room and ends up babysitting Dick's girlfriend's little sister for days.

When Veronica is released from jail, she is contacted by Josh Barry who is desperate to prove his innocence in his father's murder. Meanwhile, Keith gets bittersweet news from the county commissioner, and Logan helps Mac and Parker on a scavenger hunt.

When Veronica discovers Timothy Foyle breaking into Mars Investigations, she uses his help to track down Dean O'Dell's true killer. Meanwhile, Logan and Parker's relationship takes an unexpected turn, and acting Sheriff Mars brings another murderer to justice.

With Keith acting-sheriff, Veronica goes solo on a case involving a local restaurant whose owners are the targets of hate crimes. Meanwhile, Keith is disturbed by the lack of professionalism in his deputies when he orders them to fine bars serving alcohol to underage patrons. Logan throws a birthday party for Parker, and Piz decides to finally confront Veronica about his feelings.

Desmond Fellows, a singer/musician from a 1990's pop band arrives on the Hearst campus to perform at a benefit concert to keep the station from going out of business. Piz gets the job of his dreams when he is put in charge of hosting Fellows around campus and on air. However his dreams start to dissolve as things don't go quite how he imagined, in more ways then one. Keith is excited about the upcoming Sheriff's race unopposed until he unwittingly helps promote an unlikely candidate who throws his hat into the ring.

Apollo, a Hearst student who suffered hardships as a child soldier in Africa, appears on Piz's radio show, prompting a man to come forth claiming to be his father. But Veronica's investigation unearths some surprises. Meanwhile, Neptune is faced with a crime spree that could spell trouble for Keith's campaign, and Logan finds himself in a difficult situation when Parker wants to spend to summer with him. Veronica awaits the results of her FBI exam.