Three psychopaths live in the mountains with Yves, a 13-year-old they've taken under their wing. They teach him only the things their demented minds can grasp; evil, Satan and suffering. Anne and Frederic are hiking when Anne twists her ankle. While Frederic is looking for help, Anne witnesses the carnage of the mountain men. The mountain becomes a spring of blood as these maniacs show their primal ways and the hikers fight for their lives.