Bela Lugosi, Boris Karloff, David Butler, Peter Lorre, Monte Brice, Kay Kyser, James V. Kern, Andrew Bennison, R.T.M. Scott

You'll Find Out is a movie starring Kay Kyser, Peter Lorre, and Boris Karloff. 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.