Book excerpt: To whom does the past belong? Is the archeologist who discovers a lost tomb a sort of hero -- or a villain? If someone steals a relic from a museum and returns it to the ruin it came from, is she a thief? Written in his trademark lyrical style, Craig Childs's riveting new book is a ghost story -- an intense, impassioned investigation into the nature of the past and the things we leave behind. We visit lonesome desert canyons and fancy Fifth Avenue art galleries, journey throughout the Americas, Asia, the past and the present. The result is a brilliant book about man and nature, remnants and memory, a dashing tale of crime and detection.