While it had one or two actual jump scares in it (a rarity for American films of this vintage), this is more of a mystery movie. The performances are all above average for a B-movie and it does have a certain style to it, but this movie is just silly and riddled with plot holes. The movie ends with a climax so ridiculous it's probably worth watch or at least just fast forwarding to the end.
The House on Haunted Hill
Submitted by Robert Gomez on