You'll Find Out is a 1940 American comedy film directed by David Butler and starring Kay Kyser.

In the film, members of an orchestra hired to play at a young heiress's birthday party uncover a plot against her.

[1] After Kay Kyser and his orchestra arrive at a castle-shaped mansion, the drawbridge leading to it is mysteriously dynamited, stranding both entertainers and guests.

He is taking advantage of the heiress' Aunt Bellacrest's belief in spiritualism to swindle the estate out of large sums of money.

After a series of typical "haunted house" jokes, Kyser uncovers a basement "command center" that provides the special effects for Saliano's phony seances.