You'll Find Out (1940)

You'll Find Out is a 1940 horror comedy film starring Kay Kyser, Boris Karloff, Bela Lugosi, Peter Lorre, Helen Parrish, and Dennis O'Keefe.

Plot
Kay Kyser and his band go to a spooky mansion for the birthday part of an heiress where the guests become stranded in a storm as sinister forces attempt to kill her.

Cast

 * Kay Kyser
 * Peter Lorre as Karl Fenninger
 * Boris Karloff as Judge Spencer Mainwaring
 * Bela Lugosi as Prince Saliano
 * Helen Parrish as Janis Bellacrest
 * Dennis O'Keefe as Chuck Deems
 * Alma Kruger as Aunt Margo Bellacrest
 * Joseph Eggentom as Jürgen
 * Kay Kyser Band
 * Ginny Simms