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.

Now a fascinating six-part Sky History docu-drama, The Lost Women Spies reveals that virtually no one - least of all the media - knew about it. What followed was a story of astonishing bravery by ...