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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. While exploring an abandoned visitor center, they are stalked by a masked killer and brutally murdered one by one… only to wake up and 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—only each time the deadly threat is different, and each time more terrifying than the last. With hope fading, the group soon realizes that their body count is limited and that their only way to escape is to survive until dawn.