A sick Italian at Mama Pizza's starts Sam on a trail that takes him out onto San Francisco Bay and toward a mysterious postcard meant for Boris. The strange clues develop into a case involving espionage, violence and murder.

This The Adventures of Sam Spade broadcast aired on December 15, 1950. NBC Radio Network carried the broadcast. The cast includes Steve Dunne and Lurene Tuttle.

Characters credited in this version include Sam Spade and Effie Perrine.

Dashiell Hammett's private detective Sam Spade, played most famously by Howard Duff, recounts hard-boiled cases filled with murder, deception, eccentric suspects, and sharply comic dialogue.

Listeners can expect detective and crime, episodic drama in format, and hard boiled, wry, and humorous in tone.