From the author of the #1 bestseller The Girl in the Spider's Web, an electrifying thriller that begins 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