Psych: Season 3, Episode 14

3 - 14: Truer Lies

A pathological liar Ryan (Jonathan Silverman) with a history of lying to the police is suspected of killing his super, and also claims to know about an assassination plot. Shawn is able to figure out that this liar is actually telling the truth, which leads him and Gus to an amnesiac, Tom Lieber (Jared Hillman), and the truth behind the case.