"The Gold Key Caper" (originally broadcast on January 25, 1948) follows private investigator Sam Spade as he is hired by a panicked client to recover a mysterious golden key, only to quickly find himself entangled in a web of deceit, blackmail, and murder. As Spade digs into the case, he navigates a shady cast of characters, each desperate to claim the treasure the key unlocks, leading him through a series of tense confrontations and clever bluffs in classic hard-boiled style. Ultimately, the cynical detective uses his sharp wits and street smarts to outmaneuver the criminals, expose the killer, and deliver his trademark brand of rough-hewn justice just before wrapping up the case with his loyal secretary, Effie Perrine.