Academic researcher Mr Anderson of Viborg studies Reformation history, and stays at an inn where Room 13 mysteriously appears at night, despite the landlord claiming it doesn't exist, leading to escalating supernatural disturbances—noises, vanishing furniture, and ominous figures—as Anderson uncovers a witchcraft scandal connected to the phantom room, culminating in an attack and a chilling glimpse into the room's dark occupant before the supernatural presence fades, leaving behind unsettling remnants.