In the Light of What we Know Hardcover by Zia Haider Rahman

An investment banker approaching forty, in the midst of his career collapsing and marriage unravelling, receives a surprise visitor at his West London townhouse. Confronting the dishevelled figure of a South Asian male carrying a backpack, the banker recognizes a long-lost college friend. From here, the novel takes us on a journey of exhilarating reach and scope, ranging over Kabul, London, New York, Islamabad, Oxford, Princeton and Sylhet and dealing with love, philosophy, identity, finance, mathematics, cognitive science, literature and war. Its framework is an age-old story: the friendship of two men and the betrayal of one by the other. But within this framework the author has touched down on everything important in our young century and has translated all this into his fiction.

Set against the breaking of nations and beneath the clouds of economic recession, the novel chronicles the lives of people carrying unshakeable legacies of class, culture and faith as they struggle to tame their futures and as one man attempts to climb clear of his wrong beginnings. In the Light of What We Know is tender, intimate, beautifully fluid and surprising. Reading it feels like overhearing a conversation that takes you to places you had only glanced at before.