You'll Find Out 1940

Synopsis:

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.

Directed by: David Butler
Written by: James V. Kern
Runtime: 97 minutes
Tagline: A Cold-Shiver MYSTERY With Hot-Rhythm MUSIC!
Cast:
Kay Kyser
Kay Kyser
Himself 
Peter Lorre
Peter Lorre
Professor Karl Fenninger 
Boris Karloff
Boris Karloff
Judge Spencer Mainwaring 
Bela Lugosi
Bela Lugosi
Prince Saliano 
Helen Parrish
Helen Parrish
Janis Bellacrest 
Dennis O'Keefe
Dennis O'Keefe
Chuck Deems 
Links:
IMDb You'll Find Out movie stills
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Also known as:
  • The Old Professor