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.

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.

With only a commonplace name, an old address and dim memories as leads, Veronica and Wallace attempt to help classmate Justin Smith find his father John, who disappeared 10 years earlier.

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.

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.

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.

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.

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.

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.

When Weevil's poker winnings go missing after a game at Logan's place, Veronica questions each player to piece together the evening's events and catch the thief. Meanwhile, on the eve of the Echolls' annual Christmas party extravaganza, Keith is hired by Lynn Echolls to track down one of her husband Aaron's potential stalkers.

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.

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 suicide, 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.

Veronica surprisingly finds herself working as a "love detective" when she's asked to track down her friend Meg's secret admirer and a Russian bride's estranged fiancé.

Following an emotional reunion with her mother, Veronica is hired to track down Neptune High's beloved mascot, Polly the Parrot, which was apparently kidnapped by a rival school on the eve of a big basketball game.

Veronica investigates who at school is doing everything possible to distract Sabrina from studying and wreck her grades in an obvious attempt to sabotage her chances at becoming valedictorian.

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.

While helping her classmate Mandy search for her missing Jack Russell terrier, Veronica stumbles onto a bigger mystery, which affects pets all over Neptune.

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.

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 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.