This compelling new drama series stars Tim Roth as Dr. Cal Lightman, the world’s leading deception expert who studies facial expressions and involuntary body language to discover not only if someone is lying, but why. Based on the real-life scientific discoveries of Dr. Paul Ekman, the series follows Lightman and his team of deception experts as they assist law enforcement and government agencies to expose the truth behind the lies. In the series opener, the son of a family of devout Jehovah’s Witnesses is accused of killing his teacher after being caught fleeing the scene of her murder. Meanwhile, the team is hired by the Democratic National Committee to investigate a second case in which the Chairman of the House Ethics Committee is accused of paying for sex.

When a female soldier charges a commanding officer with sexual assault, Lightman is brought to Fort Meade to find out if there's any truth to the accusation. Meanwhile, the Lightman Group is hired to determine whether the young star of a college basketball team accepted a bribe to play for the university.

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. The team also investigates a NASA test pilot accused of intentionally crashing a $250 million aircraft.

At a state wedding, Lightman and his team work to prevent the assassination of a South Korean ambassador. But when someone else is shot, Lightman exposes long-held family secrets and lies to identify the assassin.

Lightman 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. Foster and Loker investigate the death of a firefighter who was killed in the line of duty.

Lightman and Foster investigate the disappearance of an 11-year-old girl. Loker and Torres must determine whether a famous peace activist is who she claims to be and if her bestselling memoir is true.