Mr. Bones, the canine hero of Paul Auster’s astonishing new book, is the sidekick and confidant of Willy G. Christmas, a brilliant and troubled homeless man from Brooklyn. As Willy’s body slowly expires, he sets off with Mr. Bones for Baltimore in search of his high school English teacher and a new home for his companion. Mr. Bones is our witness during their journey, and out of his thoughts, P...