Not really a horror film,(no monsters or gore), but a lot of creepiness and insanity. This movie has great sustained suspense that keeps you guessing what is real, which character is crazy, and which character is who they say they are. Future star Oliver Reed is very young and handsome, but hasn't learned to act very well yet, but he is entertainingly over-the-top. The whole thing is very well-done and a hell of a lot of fun to watch.