Against the backdrop of the unaccountable disappearance of three young Americans, a quartet of camp counsellors arrive at the remote El Buho Summer Camp in northern Spain to give English classes to local children. However, as the instructors prepare for the eventful season ahead, a horrible incident becomes the harbinger of violence, and suddenly, one of them snaps. As a result, a highly transmittable, frenzy-inducing virus begins to take hold, and no one is safe from harm. But when murderous delirium prevails over logic, the chances for survival are zero. Will the nightmare ever end?—Nick Riganas