The Gorilla ( 1939)

 The Gorilla (1939) is an "old dark house" horror/comedy  starring the legendary Bela Lugosi (original Dracula[1931]) and The Ritz Brothers (a poor man's version of The Marx Brothers). Ever since Edgar Alan Poe wrote the first detective mystery with Murders in the Rue Morgue, Gorillas have had their place in horror from King Kong (1933) to Disney cartoons with Donald Duck. This film attempts to channel the thrills of silent horror murder mystery films like 
The Cat and the Canary(1927) (recreating its most famous scene) 
and fuse it with the aforementioned fear of gorillas. The film takes place in a millionaire's mansion (full of secret passages) during a storm of course.
This came out the same year as the Bob Hope sound
 remake of The Cat and the Canary (1939). The gorilla isn't as good as the bob hope film, but this is still a classic even though the costumes might be hokey and some of the jokes fall flat it is still fun and well put together. 
 I give it a 4/5. I first heard about this film from this book to the right:
and the film is available through Turner Classic Movies (TCM) with xfinity OnDemand or to stream at tcm.com/watch.