One year after her sister Melanie’s mysterious disappearance, Clover and her friends travel to the remote valley where she vanished in search of answers. Exploring an abandoned visitor center, they discover they are being stalked by a masked killer and murdered one by one… only to wake up and return early the same night. Trapped in the valley, they are forced to relive the nightmare over and over again – only each time the killer’s threat is different, each more terrifying than the last. With hope dwindling, the group soon realizes they have a limited number of victims and that the only way to escape is to survive until dawn.