Anne Baxter is Evelyn Heath, a mentally unstable woman who moves in with her fiances family and slowly but surely things start to spiral out of control.
She is almost immediately smitten with Doug Proctor (Ralph Bellamy) the brother of her intended. Doug's career and marriage are both pushed to the limit and almost ruined by the sly and sometimes very cruel Anne, who even uses a little girl to get her ways with the family.
This story takes a while to start, but once it does it just gets darker and darker. For some reason I had never heard of this film before.
It's an excellent film noir that is extremely well acted by a great cast. The print is fairly good from Mill Creek, and I don't know if there is a better one out there.
Anyway, the film is very well made and the idea of an entire happy family being turned on itself by one evil woman is clever and handled well by director John Brahm. If you get a chance to see this little gem, you won't be disappointed. It's rather hard to find, even though it is in the public domain.
The rest of the cast includes Percy Kilbride, Margaret Hamilton, Marie McDonald, and Ruth Warrick.