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 Puzzle Book, the UK's intelligence and security experts tested us with puzzles, codes and real-life entrance tests from their archives. Now, they are back with a new collection of head-scratching, mind-boggling and brain-bending puzzles that will leave you pondering for hours.
For those who often found themselves stumped with the first book, there will be even more starter puzzles to get those brains warmed up. Puzzle aficionados needn't worry though, as there will also be an 'Even Harder' section to test everyone to their limits.
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