An exuberant, hands-on fly-on-the-wall account that combines the thrill of canyoneering and rock climbing with the intellectual sleuthing of archaeology to explore the Anasazi. David Roberts describes the culture of the Anasazi--the name means "enemy ancestors" in Navajo--who once inhabited the Colorado Plateau and whose modern descendants are the Hopi Indians of Arizona. Archaeologists, Roberts writes, have been puzzling over the Anasazi...