"An electrifying thriller that opens with Alan Turing's suicide, and then opens out to take in a young detective's awakening to painful secrets about his own life and the life of his country. It's 1954. Several English nationals have defected to the USSR, while a witch-hunt for homosexuals rages across Britain. In these circumstances, no one is surprised when a mathematician by the name of Alan Turing, is found dead in his home: it is widely assumed...