A deception expert works with law-enforcement agencies, lawyers and private companies to sort out the facts in cases. Based on the real-life experiences of psychologist Paul Ekman, an expert in how facial expressions can betray emotions.
Cal commits himself to a mental hospital to investigate whether a patient is being held there legitimately and comes to question his own sanity as well. He also confronts his past in hallucinations in which he reminisces with his late mother (Paula Malcomson) and confronts his father (Enzo Cilenti).
A terminally ill restaurateur (John Amos) hires Cal to track down his murdered daughter's killer. She had been first in line to inherit her father's successful restaurant chain, and Cal discovers that this fact could have something to do with her death.
Cal investigates a coal-mine explosion that killed six miners, and he suspects foul play. So to prove it he goes into the mine. Meanwhile, the FBI seeks the Lightman Group's aid again, and Foster and Torres offer to work pro bono.