You'll Find Out

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.

Kyser is suspicious of mystic Prince Saliano, and for good reason. He is taking advantage of the heiress' Aunt Bellacrest's belief in spiritualism to swindle the estate out of large sums of money. Saliano has been "planted" in the house by the "respectable" family attorney, Judge Mainwaring. Also in on the swindle is Professor Fenninger, who claims to be an expert on uncovering phony spiritualists (something he has no real intention of doing).