In 1914 Vienna, Elsa Elsbergen volunteers for nursing, but her lies hiding her sordid past are discovered and she is turned down.

His superior, Major Schmidt, wants her to become very friendly with Captain Otto von Lichstein, who is known to be spying for the enemy.

Its passenger, Sub-Leutnant Count Karl Runyi of the Royal Navy, is very apologetic and insists on seeing her home.

The drunk young man is soon boasting to von Lichstein about the exploits of the three submarines, and in particular their secret return route under the very noses of the enemy.

Von Lichstein decides that this would be a fitting culmination of his espionage career and prepares to deliver the information personally.

[3] Critic Paul Mavis later wrote that the film had "a good performance by Twelvetrees doing what people wanted a female spy to do in 1931.

"[4] The film was overshadowed by another, similarly themed 1931 release, director Josef von Sternberg's Dishonored starring Marlene Dietrich.