At 4:30PM on Sunday October 31st, 1948, True Detective Mysteries signed on. The program had a rating of 10.7. It was Mutual’s number two show overall. Based on items from True Detective magazine, the series was sponsored by Oh Henry Candy bars.

Many of the stories unfolded from the criminal’s viewpoint: the show was much like Gangbusters in allowing the audience to witness the fatal mistakes that led to the culprit’s capture. Borrowing yet another page from Gangbusters, the magazine offered rewards of $500 (later $1000) for information leading to the arrest of real criminals. Clues were given after each broadcast: these were highly descriptive, focusing on scars and deformities, and the show resulted in many arrests.