Letter from an Unknown Woman is a 1948 film directed by Max Ophüls. It was based on the novella of the same name, which was written by Stefan Zweig. The film stars Joan Fontaine, Louis Jourdan, Mady Christians and Marcel Journet. In 1992, Letter from an Unknown Woman was selected for preservation in the United States National Film Registry by the Library of Congress as being "culturally, historically, or aesthetically significant". The film is set mainly in Vienna in the early 1900s. Pianist Stefan Brand (Louis Jourdan) arrives home a few hours before he is due to fight with a champion duellist, a challenge he has every intention of evading by leaving the city. Before leaving, he reads a letter received that night that begins with "by the time you read this I may be dead." The story then switches to the point of view of the letter-writer, Lisa (Joan Fontaine), as it goes back in time to when she was a teenage girl living in a Vienna apartment complex. She is fascinated by a new tenant, prodigious musician Stefan, and his variety of fabulous instruments, including a harp and a piano.