Yes, it is worth watching if you are classic film fan as I am. It is not an example of great film making how ever as a B movie it's much better than most. Anthony Mann directed the movie as he did many other B movies in the 40's. He was always in demand because he had a reputation of creating not really good movies but watchable movies with very low budgets that consistently made money. For example, this movie was made for $5,000. It made $10,400 in it's opening week which means it probably pulled an equal amount over next few months running on double features and drive-ins before being achieved. A few years latter it was re-released. And beginning in the late 50s on, it played late night movies for decades and was finally transferred to DVDs for sale and rental. Just guessing but I would bet this $5,000 movie made at least 20 times that and is probably still making a few bucks.
The Story idea was good and the script was not so good and even a bit corny at times. The acting/directing was pretty good. Helene Thimig was very good as Mrs. Blake.
A much better production although quit dated due to the number of times the story has been re-used, is the "The Uninvited", 1944. It is the classic ghost story with Ray Milland and Gail Russell. One of the components of the movie is the wonderful theme music, Stella by Starlight which for some reason was not used in the trailer.
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