Gyles Isham

The WW1 melodrama I Married a Spy was originally released in England in 1937 under the title Secret Lives (the title of the Paul de Sainte Colombe novel upon which it was based). German film favorite Birgitte Horney stars as Lena Schmidt, a Teutonic lass who is forced into a marriage of convenience with French lieutenent Pierre de Montmalion (played by Hollywood's Neil Hamilton). (allmovie.com)

A man ignores a warning to stay away from a sinister house on marshland near Liverpool; when someone drowns close by, he finds the evidence doesn't add up...

When a German spy realizes that he is being followed by British agents, he gives the secret information he is carrying to his girlfriend. When he is killed, she gives the information to his superiors, and herself becomes a spy, hoping to get revenge for his death. She is then sent on several dangerous and deadly missions during World War I that cause her to question whether what she is doing is right. (imdb)