The Professor and the Puzzle

Box 13 is a syndicated radio drama about the escapades of newspaperman-turned-mystery novelist Dan Holiday, played by film star Alan Ladd. Created by Ladd's company, Mayfair Productions, Box 13 aired in different cities over different dates and times. It first aired in several United States radio markets in October 1947.

Wikipedia. CC BY-SA 4.0. Updated May 12, 2025.

“The Professor and the Puzzle.” Box 13. Radio broadcast, January 9, 1949.