Young Daniel Villena goes on holiday with his family to a small seaside town. There he meets an extraordinary boy who mysteriously appears and disappears and is able to enter his dreams and turn them into genuine nightmares. One day, Daniel receives an anonymous letter containing thirteen threatening words: "Let the dead rest in peace or you'll soon be one of them". From that moment on, Daniel finds himself sucked into an adventure full of bodies, enigmatic individuals and inexplicable events. An adventure where nothing is what it seems.