I watched Allied the movie.
This is the story of 2 spies who fall in love and get married in London. However, after 2 years, British intelligence begins to suspect that one of them is a German spy, rather than merely French resistance.
At first it seems that the the husband will prove that his wife is innocent but gradually he learns that his wife has been spying for the Germans and the question is what will he do. He tries to help her and both of them try to escape, but she must kill herself so that her daughter and the husband can survive.
Oh, it is being said that this was based on true events!