The film is (loosely) based on a real incident. In the late 1910s and early 1920s, Dolly Oesterreich kept her lover, Otto Sanhuber in the attic where he lived for many years. Her husband Fred ran a company that made aprons. Otto even moved with the couple from Milwaukee to Los Angeles to stay above his lover. Unfortunately, the real story doesn't have the happy ending of the movie.
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