9 August, 1945, Nagasaki: Hiroko Tanaka, twenty-one and in love with Konrad Weiss, the man she is about to marry, steps out onto her veranda, minutes before a nuclear explosion shatters her world and everything in it.

Travelling to Delhi two years later in search of new beginnings, she meets Konrad's half-sister, Elizabeth, her husband James Burton, and their employee Sajjad Ashraf. As the years unravel, the shadows of history - personal and political - are cast over the entwined worlds these people inhabit as they are transported from Pakistan to New York, and in the novel's astonishing climax, to Afghanistan in the immediate wake of 9/11.