Taking its cue from the arrest and legally enforced chemical castration of the mathematician Alan Turing, Murmur is an account of a man who responds to intolerable physical and mental stress with love, honour and a rigorous, unsentimental curiosity about the ways in which we perceive ourselves and the world. Formally audacious, daring in its intellectual inquiry and unwaveringly humane, Will Eaves’s new novel is a rare achievement.