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1941–1948: Last work and retirement

With George Cukor's Two-Faced Woman (1941), MGM attempted to capitalize on Garbo's success in Ninotchka by re-teaming her with Melvyn Douglas in another romantic comedy which sought to transform her into a chic, modern woman. She played a "double" role that featured her dancing the rhumba, swimming, and skiing. The film was a critical failure, but, contrary to popular belief, it performed reasonably well at the box office. Garbo referred to the film as "my grave". Two-Faced Woman was her last film; she was thirty-six and had made 28 feature films in a span of 16 years.

Although Garbo was humiliated by the negative reviews of Two-Faced Woman, she did not intend to retire at first. But her films depended on the European market, and when it fell through because of the war, finding a vehicle was problematic for MGM. Garbo signed a one-picture deal in 1942 to make The Girl from Leningrad, but the project quickly dissolved. She still thought she would continue when the war was over, though she was ambivalent and indecisive about returning to the screen. Salka Viertel, Garbo's close friend and collaborator, said in 1945: "Greta is impatient to work. But on the other side, she's afraid of it." Garbo also worried about her age. "Time leaves traces on our small faces and bodies. It's not the same anymore, being able to pull it off." George Cukor, director of Two-Faced Woman, and often blamed for its failure, said: "People often glibly say that the failure of Two-Faced Woman finished Garbo's career. That's a grotesque over-simplification. It certainly threw her, but I think that what really happened was that she just gave up. She didn't want to go on."

Still, Garbo signed a contract in 1948 with producer Walter Wanger, who had produced Queen Christina, to shoot a picture based on Balzac 's La Duchesse de Langeais. Max Ophüls was slated to adapt and direct. She made several screen tests, learned the script, and arrived in Rome in the summer of 1949 to shoot the picture. However, the financing failed to materialize, and the project was abandoned. The screen tests—the last time Garbo stepped in front of a movie camera—were thought to have been lost for 41 years until they were re-discovered in 1990 by film historians Leonard Maltin and Jeanine Basinger. Parts of the footage were included in the 2005 TCM documentary Garbo.

In 1949, she was offered the role of fictional silent-film star Norma Desmond in Sunset Boulevard, directed by Ninotchka co-writer Billy Wilder. However, after a meeting with film producer Charles Brackett, she insisted that she had no interest in the part whatsoever.

She was offered many roles both in the 1940s and throughout her retirement years but rejected all but a few of them. In the few instances when she did accept them, the slightest problem led her to drop out. Although she refused throughout her life to talk to friends about her reasons for retiring, four years before her death, she told Swedish biographer Sven Broman: "I was tired of Hollywood. I did not like my work. There were many days when I had to force myself to go to the studio... I really wanted to live another life."