William Bonney, a.k.a. “Billy the Kid,” killed his first man when he was twelve. By the time he was twenty-one he had, by his own reckoning, slain nineteen more. In the intervening years he had become “Billy the Kid,” bloodthirsty ogre and outlaw saint. Drawing on contemporary accounts, period photographs, dime novels and his own fund of empathy and imagination, Michael Ondaatje traces Billy's passage across the blasted landscape of 1880 New...