Mysterious Intruder

A sharp, calculating private detective hired by Stillwell who pieces together a tangle of deception. He moves cautiously, relying on wit and persistence to sift truth from lies. His pragmatism drives the investigation forward.

A young woman who claims to be Elora Lund, only to be revealed as part of a larger scheme. Her interaction with Gale reveals the fragility of identity and motive in a web of lies. She acts as a catalyst that intensifies the pursuit of the recordings.

The real identity behind the claimed Elora Lund, and Gale's accomplice. Her presence escalates the plot until Summers discovers her body, underscoring the deadly stakes of the case.

Manager of the apartment building where Hanson lives, a schemer who tries to cut Gale in on the recordings. He becomes entangled in a violent confrontation that exposes the rivals' ambitions.

The killer who murders Stillwell and abducts the supposed Elora Lund, sparking the chase that drives the film. His actions set off a chain of confrontations that escalate toward a final showdown.

Aged music store proprietor who hires Gale and becomes a victim of the ensuing violence. His murder sets the investigation in motion and connects the threads of the case.

Gale's associate who collaborates in the scheme around the mysterious recordings. Her role links Gale to the pursuit of wealth and danger.

Gale's secretary who senses trouble and warns him as the net tightens. Her knowledge of Gale's movements reflects the information flow within the investigation.

A neighbor in the basement world of the Brass Shop who becomes a casualty in the pursuit of the recordings. His death deepens the danger surrounding the search.

A signature noir voice that adds atmosphere to the film, signaling the era’s mood and heightening tension in key scenes.