College friends find their weekend of sex and debauchery ruined when deadly zombie beavers swarm their riverside cabin.

A year after losing his friend in a tragic 4,000-foot fall, former ranger Gabe Walker and his partner, Hal, are called to return to the same peak to rescue a group of stranded climbers, only to learn the climbers are actually thieving hijackers who are looking for boxes full of money.

An FBI agent is suspicious of two master thieves, quietly enjoying their retirement near what may – or may not – be the biggest score of their careers.