Tim Roth as Dr. Cal Lightman, is a genius psychologist with an expertise in body language and predominantly microexpressions and founder of The Lightman Group, a private company that operates as an independent contractor to assist investigations of local and federal law enforcement through applied psychology. Though often confronted by people's skepticism, Lightman uses any psychological technique he deems necessary to reach the truth, however elaborate or confronting. He is divorced, and has shared custody of his teenage daughter. He cares deeply about Gillian Foster, and there is a chemistry between them that has yet to develop into anything more.
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