Plot summary
Cal's old friend Terry Marsh ( Lennie James ) pulls him into a criminal conspiracy after he settles Terry's gambling debts. The criminals abduct both Cal and Terry and try to recruit Cal to be their personal lie detector, forcing him to determine the validity of a client's counterfeit bills. Over the course of the episode, it is revealed that both Terry and Cal got into trouble with the police when they were young, and that Terry volunteered to take all the blame, allowing Cal to continue with his life. The event ends with an FBI raid, and Lightman tells Terry that they're even. Meanwhile, the Lightman Group probes murderous threats against a high school. They determine that the threats were made by student Stacey, but is she actually a victim?
Credits
Adapted from Wikipedia contributors, List of Lie to Me episodes. HTML formatting and reference markers removed.