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From the liner notes

Four friends head out for a mountain retreat for a weekend, unsuspecting of the horrors that await. Filled with rest and relaxation, anticipating a joyful stay, they suddenly bear witness to a gruesome murder at a nearby cabin. Distraught and disoriented, they decide to immediately head home, wanting to forget the whole tragic experience. Driving back, away from the cabin, does not diffuse the horrific images locked inside their heads. They are soon to realize it won't be easy to rid themselves of the experience, as they are followed home by the sadistic murderer, hell–bent on ridding his crime of any witnesses capable of talking...