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Straight from the desks of the top spies at GCHQ, give your brain a workout with this children's puzzle book.
Testing cross-disciplinary analytical skills in languages, logic, maths, engineering, code-breaking and more, this will be the ultimate challenge for would-be spooks, young and old.
Paperback, 336 pages. Measures 15.2 x 21.5 x 2.9cm
