Dr. Cal Lightman ist der Gründer und Leiter der 'Lightman Corporation', einem Unternehmen, das anhand der Analyse von Gestik, Mimik und Körpersprache ihres Gegenübers feststellen kann, wer lügt und wer die Wahrheit sagt. James Cole wird vorgeworfen, seine Lehrerin Susan McCartney ermordet zu haben. Bei seiner ersten Unterredung mit dem 16-jährigen Schüler kommen Cal allerdings erhebliche Zweifel an James' Schuld.

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Lightman's team investigates cases involving a staff sergeant accused of raping a soldier, and a star college basketball player accused of taking a bribe from a wealthy booster.

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An investigation into the death of a judge's daughter leads Dr. Lightman to the girl's prep school, while Dr. Foster investigates a NASA pilot who crashed on a test flight.

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The Lie to Me gang attends a high profile wedding where the father of the groom, a Korean ambassador, has been getting death threats.

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The gang tackles 2 cases -- the suspicious death of a firefighter and the parole of a former gang leader.

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Dr. Lightman and Dr. Foster tackle the case of a missing girl. Torres and Loker focus on whether a North Ugandan woman told the truth in her autobiography about the violence in her country.

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Dr. Lightman and Torres investigate a drug company affiliated with one of Dr. Lightman's college friends. Dr. Foster and Loker help negotiate with Yemen for the release of two young Americans.

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Dr. Lightman and Torres investigate a spate of suicides in young Indian women. We discover that a suicide has helped shape Dr. Lightman. Meanwhile, Dr. Foster and Loker are at odds while they investigate a case of suspected SEC fraud.

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Dr. Lightman and Dr. Foster help FEMA run a rescue operation on a collapsed construction site. Torres and Loker talk to the girlfriend of an internet billionaire.

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Dr. Lightman's ex-wife shows up, and asks him to tackle an arson case. Torres works the case of a drive by shooting that killed a member of a rapper's entourage.

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Dr. Lightman's investigation into a questionable police shooting could jeopardize a terrorism investigation, while Eli's lie in an earlier case could hurt the firm. Meanwhile, is Dr. Foster's husband having an affair as Lightman suspects?

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On behalf of the FBI, the Lightman Group works the case of a copycat serial rapist who blinds his victims. Lightman faces off against the original rapist, a master liar.

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The whole Lightman group solves the case of terrorist bombings in the D.C. area. Dr. Foster has escalating problems with her marriage. Torres's boyfriend in the Secret Service is in danger.

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