French 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.