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.
| Actor | Role |
|---|---|
 Theda BaraPrincess Petrovitch | Princess Petrovitch |
 Edward RosemanPrince Petrovitch | Prince Petrovitch |
 Louis DeanThe Baron | The Baron |
| EEmil De VarneyThe Count | The Count |
| JJohn Webb DillionStevan (as John Webb Dillon) | Stevan (as John Webb Dillon) |
 Glen WhiteEdwin Harris | Edwin Harris |
 Mary MartinMrs. Edwin Harris | Mrs. Edwin Harris |
 Herbert HeyesMark Harris | Mark Harris |
 Kittens ReichertHarris Child | Harris Child |
| EEdward HoltHarris Boy's Father | Harris Boy's Father |
 Florence MartinMarion Harding | Marion Harding |
| GGeorge ClarkeMarion's Father | Marion's Father |
 Kate BlanckeMarion's Mother | Marion's Mother |
| CCharles McCannNot listed | Not listed |
 Hans Unterkircher(uncredited) | (uncredited) |