American film noir drama film directed by Billy Wilder, and starring Ray Milland and Jane Wyman. It was based on Charles R. Jackson's novel of the same name about an alcoholic writer.

Wilder was originally drawn to this material after having worked with Raymond Chandler on the screenplay for Double Indemnity. Chandler was a recovering alcoholic at the time, and the stress and tumultuous relationship with Wilder during the collaboration caused him to start drinking again. Wilder made the film, in part, to try to explain Chandler to himself.

Billy Wilder originally wanted Jose Ferrer for the role of Don, but he turned it down. Charles Brackett's first choice for playing Helen was Olivia de Havilland, but she was involved with a lawsuit that prevented her from being in any film at that time. It has been said that Katharine Hepburn and Jean Arthur were also considered for the role.

The majority of the film was shot at Paramount studios in Hollywood. Wilder, however, insisted they shoot part of the film on location in New York City to create a distinct sense of realism. On October 1, 1944, Wilder and his small crew began filming in New York, mostly along Third Avenue in Mid-town East Manhattan. To further create a realistic atmosphere, Wilder and his crew used hidden cameras, placing them behind boxes or in the back of trucks, and capturing Milland as he walked up 3rd Avenue among actual pedestrians who were unaware a film was being made. The production also had the unprecedented permission to film inside Bellevue Hospital in the alcoholic ward, a request that would be denied to future films. After completing filming in New York, the cast and crew returned to California to resume principal photography, where they recreated several New York locations, including a replica of P.J. Clarke's, a tavern often frequented by author Charles Jackson.

The film also made famous the "character walking toward the camera in a daze as time passes" camera effect.