A year after the mysterious disappearance of their sister Melanie, Clover and her friends venture into the remote valley where she disappeared in search of answers. While exploring an abandoned visitor center, they find themselves pursued by a masked killer and horribly murdered one by one… only to wake up to find themselves at the beginning of the same series. Trapped in the valley, they are forced to relive the nightmare over and over again – except each time the criminal threat is different, each more terrifying than the last. With hope fading, the group soon realizes that they have a finite number of dead left and the only way to escape is to survive until dawn.