Late at night, Dr. Benson drives through the countryside and stumbles upon a car crash where he finds a wounded young woman named Susan. Dr. Benson gets Susan in his car and seeks shelter for the two in a nearby castle. He is greeted at the door by Evelyn, who looks exactly like Susan, and is invited to stay the night. Dr. Benson soon meets his own doppelgänger named Peter. When in the castle, Dr. Benson discovers that in Satan's work, time and space do not follow ordinary logic.