Since the late 1870s, travelers coming out of Mexico have whispered of Mateo Madero, the captain of a gang of mysterious outlaws - bandits who prey upon bandits, killers whom other killers fear. Statements in old Pinkerton files tell of this shadowy chief, reportedly wounded in body and spirit, who suddenly vanished from the accounts of men. In the Arizona Territory, sixteen-year-old Collie Callaghan is befriended by a scarred stranger who buys her...