Crack codes, decipher ciphers and unravel mysteries with this brain-boosting collection of cryptic puzzles, inspired by the brilliant mind of famous World War II codebreaker, Alan Turing. Put your own codebreaking skills to the test, with challenges that become progressively harder, so you can start with the (relatively) easy ones and build up to expert level tests. Foreword by Dermot Turing, the nephew of Alan Turing. Paperback, 256 pages.