The film is set in Viennese high society of about 1900. After a masked carnival ball, Gerda Harrandt (
Hilde von Stolz), wife of the surgeon Carl Ludwig Harrandt (
Peter Petersen), allows the fashionable artist Ferdinand Heideneck (
Adolf Wohlbrück) to paint a portrait of her wearing only a mask and a
muff. This muff however belongs to Anita Keller (
Olga Chekhova), in secret the painter's lover but also the fiancée of the court orchestra director Paul Harrandt (
Walter Janssen), the brother of Gerda's husband. The picture is published in the newspaper. When Paul sees it and asks Heideneck some searching questions about the identity of the model, the artist is forced to improvise a story and on the spur of the moment invents a woman called Leopoldine Dur as the alleged model. Leopoldine Dur however turns out to be a real woman (
Paula Wessely), whose acquaintance Heideneck makes shortly afterwards. This makes his lover Anita so jealous that she shoots him. He survives, and Leopoldine nurses him back to health. The true identity of the sitter in the portrait remains a mystery, however. == Background ==