The Brown Envelope Case: Richard Diamond, Private Detective (December 7, 1951)

“The Brown Envelope Case” is an episode of Richard Diamond, Private Detective, the old-time radio show, first broadcast December 7, 1951. Listen free on Stupid Potato.

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What happens

Private detective Richard Diamond's car is hit by a getaway vehicle in a traffic collision. When a dead man turns up in his office demanding a brown envelope, and police reveal the hit was connected to a $600,000 armored car robbery, Diamond must piece together the mystery of what envelope the criminals think he has and why they're willing to kill for it.

New York City, including Diamond's detective office, Larson's garage, the Blue Duck nightclub, and city streets.

Characters: Richard Diamond, Helen Asher, Lieutenant Levinson, Sergeant Fraser, Dora Markham, Paul Schenell, Walt, Cismattin

Listen for: The witty banter between Richard Diamond and his secretary Helen, the escalating tension as Diamond discovers the stolen money, and the climactic shootout at the abandoned Blue Duck nightclub.

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.