Psych - Season 4 is a Comedy, Crime, Mystery TV Series whose creator is Steve Franks. It was released on 7 Aug. 2009. It stars James Roday, Dulé Hill, Timothy Omundson. The season begins with: While on vacation in Vancouver, Shawn finds himself in the presence of an elusive art thief that Lassiter has worked his whole career to catch, much to his ill, and Gus’s as well.. What await ahead?