As the 1940s got underway, bringing the U.S. closer to World War II, Humphrey Bogart drifted socially and professionally. That year he made four films: Virginia City, It All Came True, Brother Orchid, and They Drive By Night.

On Sunday January 7th, 1940 at 7:30PM eastern time over CBS, he reprised his role of Duke Mantee in a Screen Guild Theater adaptation of The Petrified Forest.

The Screen Guild Theater drew several Hollywood stars a week for radio adaptations. First taking to the air on January 8th, 1939 for Gulf Oil, all fees that would normally go to stars instead were given to the Motion Picture Relief Fund. This money was used to build and maintain the Motion Picture Country House: forty bungalow units for housing aging and needy film stars.

By the summer of 1942 almost eight-hundred-thousand-dollars had been raised. This episode’s rating was a 13. Roughly nine million listeners tuned in.

In late 1940, John Huston was adapting a script for a new film, High Sierra. Produced by Mark Hellinger and directed by Raoul Walsh, Paul Muni, George Raft, James Cagney and Edward G. Robinson all turned down the lead role, much to the delight of Huston.

The character gave Bogart the chance to show his range. Finally playing someone with depth, the film was Bogart's career breakthrough, transforming him from supporting player to leading man. He played opposite Ida Lupino.

The film's success also led to a breakthrough for Huston, giving him the leverage needed to transition from screenwriter to director, setting Bogart up for Huston’s next project: an adaptation of Dashiell Hammett’s The Maltese Falcon.

The Maltese Falcon was Huston’s directorial debut. Although a pre-code version of the film had been made ten years earlier, the 1941 version with Bogart starring as private detective Sam Spade was considered an instant classic film noir. Complementing Bogart were co-stars Sydney Greenstreet, Peter Lorre, Mary Astor, and Elisha Cook Jr.

Bogart's sharp timing and facial expressions were praised as vital to the film's quick action and hard-boiled dialogue. It was a commercial hit, and Bogart was unusually happy with the film. He later said, "It’s practically a masterpiece. I don't have many things I'm proud of, but that's one."

The film was nominated for three Academy Awards, including best picture and best direction. Bogart reprised his role on the July 3rd, 1946 episode of Academy Award Theater.