Vera Atkins' files were kept sealed until after she died, but the story of the female spies and the spy-mistress who led them, which has remained secret for over 50 years, can now be revealed.
![Syndrome [E]](https://image.tmdb.org/t/p/w300/d1KLA95GTR0WbG9dXe4JF1LRy3Z.jpg)
