One year after her sister Melanie’s mysterious disappearance, Clover and her friends venture into the remote valley where she vanished. At an abandoned visitor center, they are hunted by a masked killer and gruesomely murdered—only to awaken at the start of the same night. Trapped in a deadly time loop, they face increasingly terrifying killers with each cycle. As their deaths mount, they discover they have a limited number of chances left and must survive until dawn to escape the nightmare.