That's the alternate title of You'll Find Out (1940),
which you can watch
here!
This haunted mansion movie is perfect for Ape-ril Fools Day,
cause Kay Kyser is fooled by this taxidermied gorilla in it:
It's also perfect for Ape-ril cause it features props and miniatures from King Kong (1933).
Like the spider (from the deleted scene) and triceratops below.
Bela Lugosi, Peter Lorre and Boris Karloff are the main reasons to watch it though.
It's the only movie Bela and Peter are in together.