On Secret Service

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.

• Arthur B. WoodsDirector

• Greta NissenMarchesa Marcella Galdi
• Karl Ludwig DiehlCaptain von Homberg
• Don AlvaradoConte Valenti
• Lester MatthewsColoneilo Romanelli
• Esme PercyBleuntzli - Reporter
• C.M. HallardColonel von Waldmuller
• Austin TrevorCaptain Larco
• Cecil RamageErmete Davila
• Wallace GeoffreyB-18