A deception expert works with law-enforcement agencies, lawyers and private companies to sort out the facts in cases. Based on the real-life experiences of psychologist Paul Ekman, an expert in how facial expressions can betray emotions.
Season 2 premiere: A woman with multiple personalities (Erika Christensen) could be either a witness to a murder---or the killer. Meanwhile, the government hires the Lightman Group to question a possible Supreme Court nominee.
Zoe (Jennifer Beals) enlists the Lightman Group to probe a college-football star accused of statutory rape; Foster and Loker visit a religious compound to determine if it's a dangerous cult. Pollack: James Marsters. Mr. Reed: John Carroll Lynch.
While vacationing in Mexico, Cal and Emily get involved in the case of a missing American woman. Back in D.C., Foster and Cal's rival, Jack Rader (Marc Blucas), investigates tainted blood in area hospitals.
Cal, Foster and Reynolds go all in to find a missing finalist from the World Series of Poker in Las Vegas, where Cal must determine if the other players are being straight with him about the disappearance. Meanwhile, an analysis of Loker's latest relationship allows him and Torres to get better acquainted in the process.
Cal suspects that a charming psychology graduate student is a murderous psychopath, but the young man's teacher (who has a history with Cal) is protecting him. Meanwhile, Loker and Torres probe a claim by a teacher (Howard Hesseman) that he saw a UFO .
Cal and Zoe (Jennifer Beals) are called to witness the execution of a man (David Marciano) they helped send to death row 17 years before---and face the possibility that he's innocent. Marciano is joined in the cast by fellow alumni of "The Shield," including David Rees Snell, Catherine Dent, Benito Martinez, Kenneth Johnson and Cathy Cahlin Ryan, the wife of "Lie to Me" executive producer (and creator of "The Shield") Shawn Ryan.
Season 2 finale: The probe of the murder of Cal's friend, a journalist who was investigating political corruption, tests Cal's relationship with Reynolds and the FBI. Meanwhile, Cal is uncomfortable with Emily's newfound interest in dating.