Psych: Gus' Dad May Have Killed an Old Guy

When Shawn and Henry are invited to have Christmas dinner with Gus's parents, Bill and Winnie Guster, the yuletide cheer is interrupted by a murder. A neighbor is found dead and all the evidence points to Gus's dad as the culprit. Evidence leads the police into arresting Gus's mother as well, so Shawn and Gus vow to get them out of jail.