"The Adventures of Sam Spade" was a radio series based very, very loosely on the private detective character Sam Spade, created by writer Dashiell Hammett for his famous novel, The Maltese Falcon.
The show ran for 13 episodes on ABC in 1946, for 157 episodes on CBS in 1946-1949, and finally for 51 episodes on NBC in 1949-1951.
The series starred Howard Duff (and later, Steve Dunne) as Sam Spade and Lurene Tuttle as his secretary Effie, and took a considerably more tongue-in-cheek approach to the character than the novel or movie with Humphry Bogart. In 1947, the series received an Edgar Award for Best Radio Drama from the Mystery Writers of America. I could go on and on about the history of Sam in the media, but just check this out instead!
The Adventures of Sam Spade" I as a zip file!
The Adventures of Sam Spade" II as a zip file!