- HD 1080
- Runtime: 97m.
- Status: Released
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- Languages: en
- Country: United States of America
- Director: David Butler
- Stars: Kay Kyser, Peter Lorre, Boris Karloff, Bela Lugosi, Helen Parrish
- keywords: birthday party, bandleader, big band, old mansion
- Production_studio: RKO Radio Pictures
- Slogan: A Cold-Shiver MYSTERY With Hot-Rhythm MUSIC!
- The You'll Find Out is featured in the top rankings of 1940
- #62 in Top Comedy Movies of 1940
- #59 in Top Romance Movies of 1940
- #21 in Top Mystery Movies of 1940
- #11 in Top Horror Movies of 1940
The manager of Kay Kyser’s band books them for a birthday party bash for an heiress at a spooky mansion, where sinister forces try to kill her.
