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Theda Bara's vamping is at its most evil here. She plays the Russian Princess Petrovitch, who loves only her pearls. Her husband, the Prince (E.F. Roseman), sells state secrets to a spy to pay her exorbitant bills, and her response is to report him to the secret police. Then she runs off to Monte Carlo with her lover, Count Zerstoff (Emil deVarney), but she poisons him after he racks up a load of gambling losses. She goes to America -- followed by Stevan, a disgruntled servant (John Dillon) -- where she wreaks more havoc. The Princess' next victim is Edwin Harris (Glen White). He dumps his fiancée (Florence Martin) for the vamp and steals money from his father (Edward Holt). The shock kills the father and the Princess has Edwin sent off to jail. She next becomes involved with Edwin's brother, Mark (Herbert Hayes), inspiring him to leave his wife (Mary Martin) and child (Kittens Reichert). Finally, Edwin and Stevan -- who also has been sent to jail through the Princess' machinations -- escape from their confinement and head over to the vamp's. She tries to stab Stevan, but he turns the knife onto herself and she is fatally stabbed. But before she dies she confesses all, which clears the name of both Harris brothers, and Mark returns to his wife. It's too bad that no known print of this film exists, because on its release, Variety touted Bara as "the champ vamp of the picture world."