The Adventures of Sam Spade was a suspense/detective radio show starring Howard Duff (in the colorful title role along with Lurene Tuttle as his secretary Effie.  It was based on the private detective character created by Dashiell Hammett, well-known from the book and movie The Maltese Falcon.  The show ran from 1946 to 1951.  Duff was replaced by Steve Dunne in later episodes.The Sure Thing Caper:  "Five Dollar Frankie" has been cheated by "Gentle Joe Higgins," a known horse-doper. "Gentle Joe" has a sure thing, however, it's a most unusual sure thing!Originally aired February 9th, 1951.Support the show (https://www.buymeacoffee.com/steviek)