After Tonight

After Tonight is a 1933 American PreCode World War I spy film starring Constance Bennett and Gilbert Roland, and directed by George Archainbaud. The studio considered firing Bennett after the film lost 100,000 at the box office.

Rudy turns out to be a captain in the Austrian Ministry of War assigned to deal with Russian spies, particularly the very successful K14. He gets a lead when a secret message is intercepted it contains information about a newly improved flamethrower. Rudy is assigned to Major Lieber Edward Ellis, the man in charge of the unit developing the weapon.Rudy is delighted when Lieber introduces him to nurse Karen Schntag, his former traveling companion. Rudy sees Karen every night, and the pair fall in love. However, Karen is actually K14. She narrowly escapes being caught by Rudy and his men, then is brought in for questioning when she goes to a certain staircase that Rudy knows is being used by the Russians to transfer messages. Rudy refuses to believe she is a spy and does not even search her. Major Lieber, however, notices something odd about one of the books she had with her one page has been freshly torn out the one with an invisible message. ........

Source: Wikipedia