Five Dollar Frankie barges into Sam Spade's office swearing he's been swindled out of a guaranteed winner by Gentle Joe Higgins, a notorious horse-doper with a "sure thing" up his sleeve. Spade smells more than a fixed race, and the deeper he digs, the meaner the tip turns out to be. From radio's golden age, this 1951 NBC chapter of The Adventures of Sam Spade, Detective stars Steve Dunne as Dashiell Hammett's San Francisco private eye, with Lurene Tuttle as the unflappable Effie Perine.