Psych: Season 3, Episode 4

3 - 4: The Greatest Adventure in the History of Basic Cable

What starts out as a treasure hunt turns into a life or death situation when Shawn's uncle Jack (Steven Weber) arrives in town with a map apparently leading to an ancient Spanish treasure. Gus and Henry get involved, as well as the detectives, when all of Jack's ex-partners show up looking for the treasure, and they all have a bone to pick with him.