Pre-order the long-awaited and brain-busting sequel from the UK's finest codebreakers and puzzle-solvers at GCHQ. With their first bestselling book, The GCHQ Pu

** 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

*Featuring an introduction from Their Royal Highnesses, the Prince and Princess of Wales!* Can you think like a spy? Then we have a top secret challenge for YOU

WOULD BLETCHLEY PARK--THE TOP-SECRET HOME OF BRITISH WORLD WAR II CODEBREAKERS--HAVE RECRUITED YOU? PUT YOUR MENTAL AGILITY TO THE TEST WITH THESE FIENDISHLY CH