The Shadow: The Ruby of Karvahl; The Precipice Called Death
From 1940s radio series. Although some listings from the series say "Original Radio Broadcast," this, and others do not.
Unnamed Performers  (Performer)    Format: Audio Cassette
{"Manufacturer": "Conde Nast Publications", "Date First Available": "January 12, 2008", "Label": "Conde Nast Publications"}