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A year after her sister Melanie mysteriously disappears, Clover and her friends head to the remote valley where she vanished in search of answers. Exploring an abandoned shelter, they find themselves stalked by a masked killer and horrifically murdered one by one… only to wake up to find themselves back at the beginning of the same evening. 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 they have a limited number of deaths left, and the only way to escape is to survive until dawn.