The Whistler ran from May 16, 1942 until September 22, 1955 on the west-coast regional CBS radio network. The show also broadcast in Chicago and over Armed Forces Radio. On the west coast, it was sponsored by the Signal Oil Company: "That whistle is your signal for the Signal Oil program, The Whistler." There were also two short-lived attempts to form east-coast broadcast spurs: July 3 to September 25, 1946, sponsored by the Campbell Soup Company; and March 26, 1947 to September 29, 1948, sponsored by Household Finance. The program was also adapted into a film noir series by Columbia Pictures in 1944.
Each episode began with the sound of footsteps and a person whistling. (The Saint radio series with Vincent Price used a similar opening.) The haunting signature theme tune was composed by Wilbur Hatch and featured Dorothy Roberts whistling with an orchestra.
Writer-producer J. Donald Wilson established the tone of the show during its first two years. He was followed in 1944 by producer-director George Allen. Other directors included Sterling Tracy and Sherman Marks with final scripts by Joel Malone and Harold Swanton. Of the 692 episodes, over 200 no longer exist. In 1946, a local Chicago version of The Whistler with local actors aired Sundays on WBBM, sponsored by Meister Brau beer.
The stories followed a formula in which a person's criminal acts were typically undone either by an overlooked but important detail or by their own stupidity. On rare occasions a curious twist of fate caused the story to end happily for the episode's protagonist. Ironic twist endings were a key feature of each episode. The Whistler himself narrated, often commenting directly upon the action in the manner of a Greek chorus, taunting the characters, guilty or innocent, from an omniscient perspective. (Source: wikipedia.org)