Cal Lightman and his team assist federal law enforcement in the specialist field of lie detection. Lightman turns his talents to solving a teacher's murder.
Clark confronts a coldblooded Casanova who has a permanent case of hypothermia, especially when he tries to cuddle up to Chloe for her body heat. Plus, Clark and Lana enjoy an evening out on the town.
After Lightman's former Pentagon colleague is killed in a car bomb, Lightman and Foster are forced to revisit a series of events from their past.
Denny Crane finds just the right thing to cure his depression after his day-old marriage falls apart. A famous photographer's nude photos of Shirley Schmidt go up for auction.
The killing of a gay man forces David to confront his fears about his lifestyle, and Nate agrees with Brenda's parents that Billy should be institutionalised.