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It is always a pleasure to read a book where young people are celebrated for using their brains, and not just their kung-fu skills, to save the day. Nathan is determined, driven by love for his dad, and he refuses to allow his fear of heights or even a painful injury to stop him doing what he feels is right. More than once he is tempted to confide in a helpful adult, especially as the situation gets worse and worse, but in the end his courage holds and he discovers far more than he ever expected. This is a lively, quick-paced story full of incident and excitement, but utterly grounded in reality, and it makes for a thrilling read while showing just how much was achieved by the heroes and heroines of Bletchley.

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