When Howard Duff stepped up to the microphone as Sam Spade, he brought the gumshoe to life as a tongue-in-cheek tough guy and delivered one of radio's best performances. We'll hear Duff in two adventures of Spade: "The Calcutta Trunk Caper" and "The Cheesecake Caper" (rebroadcasts from the AFRS). Plus, he plays a man on the wrong side of the law in "Four Hours to Kill" from The Philip Morris Playhouse (originally aired on CBS on May 13, 1949).