The average person tells three lies in ten minutes of conversation.

DR. Cal Lightman (Tim Roth, "The Incredible Hulk," "Reservoir Dogs") can detect the truth by analyzing a person's face, body, voice and speech. When someone shrugs one shoulder, rotates their hand or raises their lower lip, Lightman knows they're lying. By analyzing facial expressions, he can read feelings - from hidden resentment to sexual attraction to jealousy.

But as Lightman well knows, his scientific ability is both a blessing and a curse in his personal life, where family and friends deceive each other as readily as criminals and strangers do. Lightman is the world's leading deception expert, a scientist who studies facial expressions and involuntary body language to discover not only if you are lying but why.

Lightman heads a team of experts at The Lightman Group who assist federal law enforcement, government agencies and local police with their most difficult cases.

DR. Gillian Foster (Kelli Williams, "The Practice") is a gifted psychologist and Lightman's professional partner who brings balance to the partnership by looking at the bigger picture while Lightman focuses on the details. He needs her guidance and insight into human behavior, whether he knows it or not. Will Loker (Brendan Hines, Terminator: The Sarah Connor Chronicles) is Lightman's lead researcher, who is so uncomfortable with the human tendency to lie that he's decided to practice what he calls "radical honesty." He says everything on his mind at all times and often pays the price.

Ria Torres (Monica Raymund, "Law and Order: SVU") is the newest member of the agency, and one of the few "naturals" in the field of deception detection. She has a raw, untrained ability to read people that makes her a force to be reckoned with.