Greta Nissen stars as an Italian noblewoman living a dangerous double life as a spy. A remake of the celebrated German thriller Spione am Werk. Co-starring noted German actor Karl Ludwig Diehl and American matinee idol Don Alvarado. The film takes place in Vienna, 1912. When an Austrian staff officer is implicated by association with a known Italian spy he goes on the run. Three years later - as the Great War gets into full swing - he returns and begs the Austrian Secret Service to allow him to clear his name from suspicion.
| Actor | Role |
|---|---|
 Greta NissenMarchesa Marcella Galdi | Marchesa Marcella Galdi |
 Karl Ludwig DiehlCaptain von Homberg | Captain von Homberg |
 Don AlvaradoConte Valenti | Conte Valenti |
 Lester MatthewsColoneilo Romanelli | Coloneilo Romanelli |
 Esme PercyBleuntzli - Reporter | Bleuntzli - Reporter |
 C.M. HallardColonel von Waldmuller | Colonel von Waldmuller |
 Austin TrevorCaptain Larco | Captain Larco |
 Cecil RamageErmete Davila | Ermete Davila |
| WWallace GeoffreyB-18 | B-18 |