At an airport, Casey, with his colleague Al (Richard Erdman), notices that the piped-in music—the love theme from "Tristan und Isolde"—is identical to the music the maid found playing on Harry's phonograph. Finally grasping the significance of the fact that the records on the machine had been changed, Casey realizes it's possible that Norah was not the killer. Following up this hunch, Casey and Police Captain Sam Haynes (George Reeves) go to a local music shop. Harry's ex-girlfriend Rose Miller (Ruth Storey) is working in the back room at the shop. The clerk tells the police that it was Rose who sold Harry the record, and calls to her to come out and help. Realizing the police are closing in, she attempts suicide.