What happens
Commander Corey and cadet Happy investigate a burglary at the Maris Design and Development Company, where a vault was broken into and valuable antiscope plans were stolen. Maris and his chief engineer, Chiller, pass a brain-a-graph test, and Corey finds fragments of broken glasses in the vault. A visit to Ward Stokes, a precision machinist with a workshop, leads the pair to a hidden room that duplicates Maris's private office. The episode, from the Space Patrol series, first aired on November 29, 1952.
Earth and the Martian desert, including the Maris Design and Development Company offices and a remote Martian hideout
Characters: Commander Corey, Happy, Howard Maris, Chiller, Ward Stokes, Dr. Preiser, Captain Scoville, Bauch
Listen for: Corey and Happy searching the Maris vault and the hidden duplicate office, and the rising tension when Stokes and Bauch realize the investigators have found them
Written from the episode itself; it never gives away the ending. Every recording is remastered for the stream: cleaned of rumble, hiss and mains hum (and the old TV whine where we found it), then levelled in two passes to steady broadcast loudness, so one show is never quieter than the next.