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A year after the mysterious disappearance of their sister Melanie, Clover and her friends venture into the remote valley where she disappeared in search of answers. While exploring an abandoned visitor center, they find themselves being pursued by a masked killer who murders them one by one in gruesome fashion… only to wake up to find themselves there later that night. Trapped in the valley, they are forced to relive the nightmare over and over again – only each time the murderous threat is different, each more terrifying than the last. With hope fading, the group soon realizes that only a limited number of dead remain, and the only way to escape is to survive until dawn.