Eileen has gone missing while hiking in the remote Ashlough Forest. Five days later, her camera is discovered washed downriver, containing bizarre photos taken after her disappearance. Eileens brother Chris wants to believe she is still alive. When the police search is abandoned, he and four of his friends create their own search party to scour the mountain range. As they stray further from the hiking trails and the unsettling discoveries mount, they begin to believe theyre not alone in the forest... and that Eileens disappearance wasnt an accident. But by that point, its already too late...