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Die Csardasfurstin (Czardas Princess) was adapted from the Emmerich Kalmann operetta of the same name. Marta Eggerth essays the title role, a regal-looking lass named Sylva Varescu. Not technically a princess, Sylva is a music-hall singer whose beauty attracts the attention of handsome prince Weylersheim (Hans Soehnker) and playboy Count Boni Kansianu (Paul Kemp). Weylersheim is anxious to wed Sylva, but he is already engaged to a young countess (Ida Wuest). This last-named character provides a handy plot solution when she falls for the Count, leaving Weylersheim free to marry our heroine. Because of the Third Reich's "racial purity" policy, the Jewish Emmerich Kalman was unmentioned in the UFA press release for Die Csardasfurstin.