The Spy in Black (1939)

When a German U-Boat captain is sent on a spying mission to the North of Scotland during World War One, he finds more than he bargained for in his contact, the local schoolmistress.
When a German U-Boat captain is sent on a spying mission to the North of Scotland during World War One, he finds more than he bargained for in his contact, the local schoolmistress.