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Baroness Gerda Wallentin (Pola Negri) walks out on her philandering husband Count Dietrich (Paul Lukas) and heads to Vienna. En route, she meets musician Raoul Stanislaw (Tullio Carminatti) and agrees to a romantic rendezvous during a stopover at a small village. In the throes of passion, Gerda and Raoul miss their train, which is subsequently involved in a terrible accident. Reported killed in the crash, Gerda, guilty over her indiscretion, decides to remain "dead" for her husband's sake. She dyes her hair, changes her name, and finds work at a gambling casino. Years pass: Count Dietrich inevitably pays a visit to the casino, and with equal inevitability falls in love with Gerda, whom he does not recognize. Our heroine is about to rekindle her romance with the Count but changes her mind when she discovers that he's still keeping company with his mistress. Telling the Count the truth, Gerda leaves him for good and departs for America, intending to start life over for a third time. Three Sinners was based on Das Zweitte Leben, a play by Bernauer Osterreicher.