A year after her sister Melanie mysteriously disappears, Clover and her friends travel to the remote valley where she disappeared in search of answers. Investigating an abandoned tourist center, they discover that a masked killer is following them and brutally kills them one by one… and when they wake up, they find themselves at the beginning of the same evening again. Trapped in the valley, they are forced to relive this nightmare again and again – only each time there is a second deadly threat, each more terrifying than the previous one. Hope fades, and soon the group realizes that the number of dead is limited, and the only way to escape is to live until dawn.