Hello, all. I'm posting because I'm looking for the name of an old mystery/sci fi/B movie. The problem is that I don't know the title or the names of the actors. I would guess that it was made in the 50's or 60's.
The basic summary of the movie is that a group of people are apparently stuck at a house/hotel and they begin hearing high-pitched noises (UFO noises?) outside the place at night. I remember there being a sketchy scientist guy with some tech equipment in his room. I also remember there being a man there with his wife, but apparently the man's former mistress somehow ends up at that same house/hotel also.
Anyway, that's probably not a great description but it's about all I've got. Does anyone have any idea of the name of the movie? Any help is appreciated!