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A year after their sister Melanie mysteriously disappeared, Clover and her friends head to the remote valley where she disappeared, in search of answers. Exploring an abandoned visitor center, they find themselves stalked by a masked killer and gruesomely murdered one by one… only to wake up to find themselves at the beginning of the same 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. Hoping it will fade away, the group soon realizes that the number of remaining dead is limited and the only way to escape is to survive until dawn.