When war is declared in 1914, glamorous Russian Carla Vanirska manages to get to Vienna from Luxembourg, with the help of Captain Rudolph Ritter of the Austrian army. Meanwhile, Ritter is assigned to detect the identity of a spy.
| Directing | George Archainbaud | Director |
| Writing | Jane Murfin | Adaptation |
| Writing | Albert S. Le Vino | Adaptation |
| Editing | William Hamilton | Editor |
| Art | Van Nest Polglase | Art Direction |
| Art | Alfred Herman | Art Direction |
| Production | Merian C. Cooper | Executive Producer |
| Writing | Jane Murfin | Story |
| Camera | Charles Rosher | Director of Photography |
| Writing | Albert S. Le Vino | Screenplay |
| Writing | Worthington Miner | Screenplay |
| Sound | Max Steiner | Music Director |
