Ten years after graduating high school, three friends, Jerry (Matthew Lillard), Dan (Seth Green) and Tom (Dax Shepard), find out that their other friend Billy died in Costa Rica from a para-sailing accident. After the burial they take a trip down to memory lane and enter their tree house where the four hung out when they were children. They find a map leading to D. B. Cooper's lost treasure that Billy has been working on his whole life. Dan takes a break from his job as a doctor and joins Jerry and Tom on a camping trip to find the treasure. They meet a sheriff at the station who decides to help out for directions to the river.