I distinctly remember seeing this, Mario Bava's last film at the Drive-In when I was a child. In the States it was released as Beyond The Door II, although it has nothing at all to do with the first film. I guess that American distributors thought that it would be an easier sell that way, even though the original was far from a hit here. I also remember this slow-burn, creepy little film, scaring the shit out of me! It is heavy on atmosphere, just the way I like them, but doesn't always make a lot of sense, but then again, when did Italian horror ever make sense?