One night socialite banker Baron Cassini attends the stage show of Eugene Charlier, who resembles him and imitates him in his act. The Baron is attracted to Charlier's jealous stage partner Mimi, while Eugene has similar ideas about Baroness Genevieve. When financial reverses lead to the Baron's disappearance, his frantic partners enlist Charlier to impersonate him; Mimi picks that night to take the Baron up on his invitation; and that's just the beginning...