** WINNER OF 'STOCKING FILLER OF THE YEAR AWARD' GUARDIAN ** Pit your wits against the people who cracked Enigma in the official puzzle book from Britain's secr

As we become ever-more aware of how our governments “eavesdrop” on our conversations, here is a gripping exploration of this unknown realm of the British se

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

The go-to intelligence expert and author of MI6 has “provided the clearest review of GCHQ and its predecessors in a publicly available book” (Firetrench). S

From the former director of GCHQ, learn the methodology used by British intelligence agencies to reach judgements, establish the right level of confidence and a