The GCHQ Puzzle BookThe definitive puzzle book from the top secret British intelligence organisation, GCHQ. GCHQ is a top secret intelligence and security agency which recruits some of the very brightest minds. Over the years, their codebreakers have helped keep Britain safe, from the Bletchley Park breakthroughs of WWII to the modern day threat of cyberattack. So it comes as no surprise that, even in their time off, the staff at GCHQ love a good puzzle. Whether theyre
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