June 8, 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 in the sleepy suburb of Wilmslow. It is widely assumed that he has committed suicide, unable to cope with the humiliation of a criminal conviction for gross indecency. But a young detective constable, Leonard Corell, who once dreamed of a career in higher mathematics, suspects greater forces are involved.
