The service offered by The Lightman Group is truly unique. Simply stated, they can tell if you're lying. It's not the words you speak that give you away, it's what your body and face have to say. Dr. Cal Lightman and his team are experts at reading micro-expressions, the fleeting tics that express, non-verbally, what we are really feeling. With their finely honed interviewing and investigating skills, they have an uncanny ability to dig up the truth. Series finale Cal takes a wicked pleasure in wiping the arrogant smirk off the face of a computer entrepreneur who Cal believes murdered one of his partners and framed his other partner in order to gain full ownership of a successful social networking site the three created together. After a baby goes missing, the investigation zigzags all over the place until Cal and his team open a massive can of worms, revealing a family completely crippled by their dysfunction. Cal investigates a deadly traffic accident caused by three high school students on a joy ride, and stumbles onto something much bigger. A wealthy woman asks Cal to check out her new boyfriend when her son discovers a briefcase filled with cash and a notebook in code. Emily seeks Cal's help for her friend who is worried about her dad, who has been in a psychiatric facility for 5 years. Cal is immediately suspicious of the facility and puts his own sanity on the line when he gets himself committed so that he can work the case from the inside.