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 The book 'The Bletchley Riddle' is a fascinating and thrilling story about cracking codes in World War ll. Nineteen year old Jakob Novis has got a job in Bletchley Park as a codebreaker to decipher the Nazis most complex code ever- the Enigma Cipher. In the meanwhile, his precocious fourteen year old sister Lizzie (Elizabeth) Novis is convinced that their mother who suddenly disappeared long ago is not dead and sets out on a perilous journey to find her. Both brother and sister are strong minds on their own, but are reunited with their love for riddles. I loved this book because it is not only engaging, as I set about doing math equations myself to solve codes!!! But also provides the reader with a perfect balance about facts from World War ll and thrilling mystery fiction. I highly recommend this book for anyone aged 11-13 years or has a deep interest in mysteries, puzzles and the Holocaust.