A Russian prince has to flee his country after fighting a duel. He falls in love with a duchess, but becomes jealous when he finds out she has a lover.

After killing a Cossack in a duel, middle-aged libertine Prince Lubimoff flees Russia with the aid of Alicia, in whom he has taken great interest. In Paris, however, Lubimoff mistakes Alicia's son, Gaston, for a young lover and leaves her. They next meet in Monte Carlo, where Alicia is desperately trying to earn money for Gaston (now a captured soldier) at the gaming tables. In the meanwhile, Lubimoff, who has lost most of his fortune during the revolution in Russia, has formed a small group called "Enemies of Women." Circumstances bring about a duel between Lubimoff and Gaston, who dies of heart failure. Lubimoff learns the truth and, chastened, leaves to serve in the war. He later finds Alicia serving as a Red Cross nurse, and they seek consolation in each other's love.