Sigrid Undset is a major figure in early-twentieth-century literature. A Norwegian born in Denmark in 1881, she worked with the Norwegian underground during the Second World War, fled to Sweden in 1940, and later came to the United States. She is the author of many works of fiction as well as several books for young readers and a number of nonfiction titles. Her novels encompass a variety of settings and time periods, ranging from medieval romances such as the Kristin Lavransdatter trilogy—generally considered to be her masterwork—and The Master of Hestviken tetralogy to modern novels such as The Winding Road, Ida Elisabeth, and The Faithful Wife. She was awarded the Nobel Prize in Literature in 1928. Sigrid Undset died in 1949.