The GCHQ Puzzle Book IIBy: GCHQ STEP ASIDE MURDLE BECAUSE GCHQ ARE BACK WITH EVEN MORE BRAIN BENDING PUZZLES TO PUT YOUR WITS TO THE TEST Now a pocket sized paperback, The GCHQ Puzzle Book II is the ideal present for armchair code breakers and amateur cryptographers alike 'Fiendish, frustrating, annoying, fulfilling' Guardian The spooks at GCHQ need your help again. Can you break these fiendish codes and prove youre a master puzzler? The defence of the realm depends on
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