Fascinating . [Ferris] has rescued several great women codebreakers from obscurity . [Bletchley Park] has become embedded in national myth, but Ferris offers cool and balanced judgment . This monumental work completes the authorised picture of a century of British intelligence, a testament to how far Britain has moved away from the cult of official secrecy Ben Macintyre The Times
John Ferris is a Professor of History at the University of Calgary, where he also is a Fellow at the Centre for Military and Strategic Studies. He received a PhD in War Studies from King's College London. He has published four books and numerous academic articles on diplomatic, intelligence and military history, as well as contemporary strategy and intelligence.