Dr. Cal Lightman teaches a course in body-language and makes an honest fortune exploiting it. He's employed by various public authorities in various investigations, doing more when the police etc. fail to go the extra mile. Today he finds out the truth about a murder involving high school-kids and/or - staff. And why Congressman Zeb Weil would rather resign under false accusations of having paid for sex than divulge his purpose in the bordello.