FROM THE INTERNATIONALLY BESTSELLING AUTHOR OF WHAT I LOVED'Astonishing . . . almost certainly the best American novel you will read this year' Sunday Telegraph'One of the most profound and absorbing books I've read in a long time' Washington Post'Wonderful . . . you have to read it to believe it' ObserverAfter their father's funeral, Erik and Inga Davidsen find a cryptic letter from an unknown w...