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One year after her sister Melanie mysteriously disappears, Clover and her friends travel to the remote valley where she vanished in search of answers. While exploring an abandoned shelter, they are stalked by a masked killer and brutally murdered one by one… only to wake up to find themselves back at the beginning of the same night. Trapped in the valley, they are forced to relive the nightmare over and over again, but each time the deadly threat is different, each more terrifying than the last. With hope fading, the group soon realizes that they only have a limited number of kills and that the only way to escape is to survive until dawn.