Dr. Cal Lightman is the world's leading deception expert. He studies facial expressions and involuntary body language to discover if and why someone is lying. He partners with a clinical psychologist, and opens up an agency that assists law enforcement, government agencies, and private individuals when they hit roadblocks in their searches for the truth. One of their first cases involves the son of a family of devout Jehovah's Witnesses. He is accused of killing his teacher after being caught fleeing the scene of her murder.
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When a commanding officer of an important military unit is accused of a sexual assault, Cal and Torres are called in to determine if the accusation is true before he is shipped back to Afghanistan; and Gillian and Eli look into whether a college basketball star took a bribe from a wealthy benefactor of the university where he plays.
The murder of a teenage girl who is the daughter of a powerful federal judge leads the Lightman Group to a highly competitive college-prep school where getting to the head of the class means everything; and the team also investigates a NASA test pilot accused of intentionally crashing a $250-million aircraft.
Cal and his team try to prevent the assassination of a South Korean ambassador at his son’s wedding, but the case takes a different turn when someone else is shot instead.
Cal and Torres interrogate an imprisoned gang leader who claims to be rehabilitated; if the gang leader is freed, he might help fight inner-city violence; or return to his life of crime; and Foster and Eli investigate the death of a firefighter who was killed in the line of duty.
Cal and Gillian investigate the case of an 11-year-old girl who has been missing for two months; and Eli and Torres must determine whether a famous peace activist’s memoir is true, but Loker's attraction to the socially conscious woman may be clouding his judgment.
When Cal is hired to find a corporate spy at a pharmaceutical company, he discovers a conspiracy surrounding a new drug that could put thousands of lives at risk; and the team is also hired by the State Department to assist with negotiations for the release of two Americans imprisoned in Yemen.
Lightman becomes obsessed with his investigation of two young women who committed suicide; and the team tries to recover billions of dollars for investors who were bilked by a Ponzi scheme.
In the wake of a building collapse, Lightman is brought in to determine who is at fault, and discovers a massive cover-up; and the team is hired by a dot-com billionaire to determine whether his girlfriend loves him for the right reasons.
When Lightman's ex-wife enlists him to help investigate an arson case in which the only eyewitness is a 5-year-old boy, it quickly becomes clear that she and Lightman still have feelings for each other; and Torres questions a rapper who is suspected of murder.
The Lightman Group gets embroiled in the controversial case of a policeman who shot a potentially innocent teenager; and investors who were bilked by a Ponzi scheme are suing the Lightman Group for botching the recovery of their money.
Ben Reynolds, an FBI agent who's pursuing a copycat rapist, partners with the Lightman Group; Cal infiltrates a prison to befriend Andrew Jenkins, a serial rapist who the new rapist may be emulating.
After a terrorist bombing, the FBI calls on the Lightman Group to help identify those responsible, and prevent more attacks; the case takes a personal turn for one member of the team, and begs the question of whether honesty is indeed the best policy.