Psych - There Will Be Murder

Chief Vick, Shawn and Gus are out on a boat secretly going to work on a case when a commander in the Coast Guard stops them and climbs aboard. She and Chief Vick begin to argue about who the case belongs to when Shawn realizes not only do they know each other but they are family. They are investigating the death of a safety inspector of an offshore oil rig, which was originally thought of as an accident. Juliet and Lassiter are investigating the disappearance of a professor at the local university.

Source: SpoilerFix