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.

• 
  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
• 
  Ginny Simms

  Herself
• 
  Harry Babbitt

  Himself
• 
  M.A. Bogue

  Ish Kabibble