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.

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.

Panic spreads through Neptune when a bomb goes off during spring break. Veronica and Keith are hired by the wealthy family of one victim injured in the bombing to find out who is responsible.

Veronica and Keith launch their investigation. Their involvement puts Police Chief Langdon on edge. Penn goes public with his theory on who the bomber is. Meanwhile, local teen Matty Ross begins her own search for her father’s killer.

Convinced the bomber is still at large, Veronica visits Chino to learn more about Clyde and Big Dick. Mayor Dobbins’ request for help from the FBI brings an old flame to Neptune. Veronica confronts her mugger.

As Veronica learns more about Nicole's past, her suspicion deepens. A frantic phone call from Paris leads to a search for Matty. Veronica unwittingly does legwork for Leo.

Veronica debates coming clean to Nicole. Veronica’s fidelity is tested. Veronica and Keith discover they aren’t the only ones who believe they’ve found the bomber. A surprising potential client tries to hire Mars Investigations.

Veronica and Keith follow a new lead, and discover another victim. Matty follows her own instincts, landing herself dangerously close to a killer. Veronica has a tragic epiphany as the clock is ticking.