During World War I, a young nurse in a hospital in German-occupied Belgium is secretly feeding military information to the British. Complicating matters is the guilt she feels when she has to treat the German casualties inflicted as a result of the information she's passed on, and the fact that the local German commandant is falling in love with her.
Herbert Marshall
as Stephan
Conrad Veidt
as Commandant Oberaertz
Madeleine Carroll
as Martha Cnockhaert
Edmund Gwenn
as Burgomaster
Gerald du Maurier
as Doctor
Donald Calthrop
as Cnockhaert
May Agate
as Mme. Cnockhaert
Eva Moore
as Canteen Ma
Martita Hunt
as Aunt Lucille
Nigel Bruce
as Scottie
George Merritt
as Captain Reichman
Anthony Bushell
as Otto
