Humphrey Bogart had been making movies for more than a decade, mostly in small character parts at Warner Bros., when he finally made the transition to leading man with this classic mystery thriller. Adapted from a novel by the legendary Dashiell Hammett, Bogart plays Sam Spade, the detective hired by femme fatale Mary Astor to protect her from a man she claims has kidnapped her sister. This film was also a breakthrough for its screenwriter, John Huston, who made one of the great directorial debuts with this picture. Bogart and Huston would collaborate on five more enormously successful films, including The Treasure of the Sierra Madre opening this year’s Plaza Classic Film Festival. The quintessential Film Noir.