Molle Mystery Theatre was a 30-minute anthology radio program that focused on stories of mystery and suspense. The show featured a distinguished "annotator" named Geoffrey Barnes, who served as an expositor, providing plot development and background information when needed. Listeners were introduced to various mysteries and their underlying crimes within each script, with the protagonistic role fluctuating throughout the series. The program showcased quality production values and performances from up-and-coming actors.

Initially airing on NBC from 1943 to 1948, Molle Mystery Theatre then transitioned to CBS where the format changed to revolve around the character Inspector Hearthstone. Over its nine-year run, the program aired under various titles, such as Mystery Theatre, Molle Mystery Theatre, Frank and Anne Hummert's Mystery Theatre, Hearthstone of The Death Squad, Inspector Mark Saber of The Homicide Squad, and Mark Saber Mysteries. Notable sponsors included Ironized Yeast, Energene, Bayer Aspirin, Sterling Drug, and Molle.

Sources: archive.org, wikipedia.org, otrcat.com