After a sequence of misfortunes, including the death of Robert's father-in-law, he and his wife Maia leave their London house and go to the place where she grew up. When Robert uncovers an ancient portrait of a guy who is his exact double in the attic, he descends into a rabbit hole to learn the identity of this enigmatic double known only as the visitor. It doesn't take him long to discover that wherever the visitor goes, death follows.