You'll Find Out

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.

• 
  David Butler
• 
  Fred Fleck

• 
  Kay Kyser
  Himself
• 
  Peter Lorre
  Professor Karl Fenninger
• 
  Boris Karloff
  Judge Spencer Mainwaring
• 
  Bela Lugosi
  Prince Saliano
• 
  Helen Parrish
  Janis Bellacrest
• 
  Dennis O'Keefe
  Chuck Deems
• 
  Alma Kruger
  Aunt Margo Bellacrest
• 
  Joseph Eggenton
  Jurgen
• 
  Ginny Simms
  Herself
• 
  Harry Babbitt
  Himself
• 
  M.A. Bogue
  Ish Kabibble
• 
  Sully Mason
  Himself
• 
  Mary Bovard
  Mary (uncredited)
• 
  Jeff Corey
  Mr. Corey (uncredited)
• 
  Louise Currie
  Marion (uncredited)
• 
  Bess Flowers
  Lady In Taxi (uncredited)
• 
  Jeanne Houser
  Jean (uncredited)
• 
  Richard Kipling
  Script Man (uncredited)
• 
  Eleanor Lawson
  Ms. Gaby Lawson (uncredited)
• 
  Larry McGrath
  Apartment Complainer (uncredited)