The Adventures of Sam Spade was a radio series based loosely on the private
detective character Sam Spade, created by writer Dashiell Hammett. 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. It starred Howard Duff, later
Steve Dunne, as Sam Spade and Lurene Tuttle as his secretary Effie. The
series was produced and directed by William Spier.