Spy Mark (Sam Neill) returns to West Berlin after a mission, to find that his wife Anna (Isabelle Adjani) wants a divorce. She is having an affair but insists that is not the reason. When Mark hires a private detective to get to the truth, an even more disturbing secret is uncovered--Anna keeps a separate apartment housing an otherworldly, tentacled creature with a ravenous sexual. So continues the descent into a nightmarish maze of jealousy, carnality devoid of satisfaction, insanity, terror and murder--where identity and reality are almost impossible to distinguish.