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Ray Henderson (Richard Shakelton), son of police inspector Bill Henderson (Roberty Shayne), has been using his tape recorder to "collect" weird sounds. Unfortunately, Ray is hoodwinked into selling a tape containing the sound of tumblers on a safe to gangster Muscles McGurk (Billy Nelson). When McGurk uses the recorded information to steal evidence against him in an upcoming investigation, Ray is implicated in the crime--and Henderson may be forced to arrest his own son. If there was ever a job for Superman (George Reeves), this is it!