Calling All Detectives is said to be the earliest form of mystery-based quiz shows. Mutual Radio (Weekly): 4/7/1945 – 8/25/1945 Syndication: 1947? – 1950? Vincent Pelletier as "Robin" (Network Run) Paul Barnes as "Dectective Jerry Browning" (Syndicated Run) In the network version, listeners were selected from cards that they sent to the show. When the mystery reached its climax, local announcers would call their listeners, and listeners who solved the mystery received prizes.