A year after her sister Melanie mysteriously disappears, Clover and her friends head to the remote valley where she disappeared in search of answers. Discovering an abandoned visitor center, they are pursued by a masked killer, killing them one by one… only to wake up and find themselves back at it that 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. With hope fading, the group soon realizes that there are only a limited number of deaths left, and the only way to escape is to survive until dawn.