See I. Castle, Castles in the Air (1958).
Irene Castle acted as advisor to this film, and constantly disagreed with the director as to details of costuming and liberties taken. When informed that white actor Walter Brennan was to play the part of faithful servant Walter, she was dumbfounded: the real Walter was Black.
Their big break comes when they are stranded in Paris, along with their friend Walter Ashe (Walter Brennan), with no money. They catch the eye of influential agent Maggie Sutton (Edna May Oliver), who arranges a tryout for them at the prestigious Café de Paris, where they become an overnight sensation. After taking Europe by storm, the Castles return to the United States and become just as big a sensation. Their fame and fortune rises to unprecedented heights in the immediate pre-World War I years.
When Vernon volunteers to join the air force, Irene makes patriotic movie serials to aid the war effort. However, Vernon is killed in a training accident, leaving Irene to carry on alone.