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A year after the mysterious disappearance of her sister Melanie, Clover and her friends travel to the remote valley where she disappeared in search of answers. While exploring an abandoned visitor center, they are chased by a masked killer and brutally murdered one by one…only to wake up to find themselves at the beginning of the same evening. Trapped in the valley, they are forced to relive the nightmare over and over again, only each time the threat of the killer is different and each time more terrifying than the last. As hope fades, the group quickly realizes that they have a limited number of deaths left and the only way to escape is to survive until dawn.