- (1953) Novel: "Magic Fire: Scenes Around Richard Wagner" (filmed as Magic Fire (1956))
- (1934) Novel: "The Phantom Crown: The Story of Maximilian and Carlota of Mexico" (filmed as Juarez (1939))
- (1935) Biography: "Royal Purple: The Story of Alexander and Draga of Serbia"
- (1938) Biography: "Farewell 'Toinette: The Story of Marie Antoinette"
- (1939) Biography: "Imperial Twilight: The Story of Karl and Zita of Hungary"
- (1940) Biography: "Hungarian Rhapsody: The Portrait of an Actress"
- (1941) Biography: "Amazon Throne: The Story of the Braganzas of Brazil"
- (1944) Biography (of the royal Hapsburg family): "Lost Waltz: A Story of Exile"
- (1947) Biography (of Eleonora Duse): "Age Cannot Wither: The Story of Duse and D'Annunzio"
- (1948) Book: "Southern Empire: Brazil"
- (1949) Book: "The Land Columbus Loved: The Dominican Republic"
- (1961) Biography: "Concerto: The Glowing Story of Clara Schumann"
- (1937) Biography: "Golden Fleece: The Story of Franz Joseph and Elizabeth of Austria"
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