Whistling in the Dark (1941)

The operators of 'Silver Haven', a cultish group bilking gullible rich people out of money, is set to inherit a large sum after the deceased woman's heir also dies. Leader Joesph Jones decides to hurry the process along and kidnaps Wally Benton, his fiance and a friend to further this goal. Wally is "The Fox", a radio sleuth who solves murders on the air. Jones wants him to devise a perfect murder and isn't above killing others sloppily along the way to get his foolproof murder plot.