You know about MI5. You know about MI6.Now discover the untold stories behind Britain's most secretive intelligence agency, in the first ever authorised history

'Fascinating ... This monumental work completes the authorised picture of a century of British intelligence' BEN MACINTYRE, THE TIMES '[A] revelatory look at th

For a hundred years GCHQ--Government Communications Headquarters--has been at the forefront of British secret statecraft. Born out of the need to support milita

A NEW YORK TIMES BESTSELLER The official book behind the Academy Award-winning film The Imitation Game, starring Benedict Cumberbatch and Keira Knightley It is

December, 1932 In the bathroom of a Belgian hotel, a French spymaster photographs top-secret documents – the operating instructions of the cipher machine, Eni