During the First World War, Russian officer Ignatoff, wounded, falls in love with his nurse, Natasha. But she is subject to an upcoming marriage of family convenience to Brioukow, a wealthy industrialist of peasant stock. Brioukow is unjustifiably jealous, since Natasha has not betrayed him. He forces Ignatoff into his debt as a means of humiliating him. When Ignatoff's new friend, Madame Sabline, offers to pay his debt, preventing his ruin, Ignatoff comes quickly to realize that Madame Sabline has an ulterior motive, one that could prove dangerous to more lives than just Ignatoff's.
| Actor | Role |
|---|---|
 Harry BaurPeter Brioukow | Peter Brioukow |
 Penelope Dudley-WardNatasha | Natasha |
 Laurence OlivierCaptain Ivan Ignatoff | Captain Ivan Ignatoff |
 Athene SeylerMadame Anna Sabine | Madame Anna Sabine |
| LLilian BraithwaiteCountess | Countess |
 Morton SeltenGeneral Kovrin | General Kovrin |
| SSam LiveseyFedor | Fedor |
| RRobert CochranPolonsky | Polonsky |
 Hay PetrieSpy | Spy |
 Walter HuddThe Doctor | The Doctor |
 Kate CutlerMadame Kovrin | Madame Kovrin |
 C.M. HallardPresident of Court Martial | President of Court Martial |
 Charles CarsonOfficer of Defense | Officer of Defense |
 Edmund WillardOfficer of Prosecution | Officer of Prosecution |
 Morland GrahamBrioukow's Servant | Brioukow's Servant |