This film is undoubtably one of the most interesting haunted house films I’ve seen to date. It’s also remarkably ahead of its time. I should mention that it’s going to be difficult to praise this in depth without spoiling the big mystery so I’ll keep things someone vague.
To get it out of the way, this is a totally imperfect movie. That’s largely in part due to the acting, which isn’t always top notch. While essential to making sense of the plot, any scenes with Orson Wells on his deathbed felt very tedious and boring. Fortunately, the ending does offer an explanation for the strange acting (which obviously wasn’t intentional).
As a whole though, this film is a wonderfully lustful, malicious story that compulsively unravels all the way towards a very strong ending. A couple things about the ending; one, it’s a modern cliche but not a cliche for 1971. Two, it’s very appropriate give the message of the film.
I did kind of fill in a lot of gaps myself that the film’s plot doesn’t explicitly state but I think my explanations are plausible enough that I can fully recommend this film. It’s been criticized for being incomprehensible without prior knowledge of the filmmakers intentions but the allegorical aspects only rely on some basic knowledge that most people have.