Catherine (Pola Negri), the czarina of a European nation, is about to be captured by rebels when suave military officer Capt. Alexei Czerny (Rod La Rocque) swoops in to save her. Catherine returns the favor with a bedroom rendezvous, and Alexei subsequently becomes bewitched by her beauty. He ditches his lover, Anna (Pauline Starke), to be with the czarina, only to find out that she entertains countless other beaus. Enraged, Alexei becomes a leader in the ongoing revolution against the royals.