In the fictional world, there’s a certain milieu in New York society where clever (and slightly bored) people in immaculate apartments spend their time having casual affairs and profound conversations at dinner parties. While Katherine Heiny’s Standard Deviation is related to this kind of literary life, its characters have considerably more heart. Its lynchpin is Graham Cavanaugh, a man on his second marriage who finds himself weighing up his two former wives. To some extent the women are types: the ex is a cool, self-contained, refined lawyer; the present wife a kooky, exuberant socialiser. How on earth, thinks Graham, did he become attracted to these two women, who are so drastically different? How can they both attract and repel different parts of himself? And how can he balance his relationship with both of them, in order to bring a kind of sense to his life? A funny, warm exploration of a mid-life crisis, Heiny’s novel considers what it means to be human through the prism of one family’s experiences.