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 Dry Martini Caper: A wealthy businessman is shot in broad daylight. Originally aired August 1st,1948.Support the show (https://www.buymeacoffee.com/steviek)