Southeastern Arizona is a tinderbox. Down Under Copper's plans to explore for minerals pit landowners, worried about their water supply and land values, against those hoping to profit from the mining venture. Someone snaps. In the traditional homeland of the Chiricahua Apaches, an environmental lawyer's body lies in the burned wreckage of his trailer. As if in retaliation, a DUC executive is shot. Geologist Frankie MacFarlane, her students, and Joaquin...