Coltons Colossal Circus

Calling All Detectives is an American radio mystery program. A 30-minute version was broadcast on the Mutual Broadcasting System April 7, 1945 - August 25, 1945. A 15-minute version was syndicated from 1947 to 1950. The first program of its kind, the Mutual version featured "nation-wide audience participation".

Wikipedia. CC BY-SA 4.0. Updated Feb 18, 2026.

“Coltons Colossal Circus.” Calling All Detectives. Radio broadcast, September 8, 1948.