Ancestral spirits demand that Marine veteran Peter Romero protect the secrecy of a sacred burial ground, and the world becomes a stranger place than he'd ever understood. He is pitted against a psychotic anthropology professor in a life-and-death struggle through the hills, arroyos, and caves of central Arizona, and into another world. When Romero's cousin is murdered, the former military policeman is astonished that the local sheriff shows no enthusiasm for solving the crime. He is forced to recognize that, after a military career, greater danger lies ahead in his civilian life. Romero takes up arms to mete out his own justice, but he must decide if he belongs to the world he sees, or to a spirit world in which he discovers the strength of his ancestors. He makes their power a part of his being. As a spirit warrior, Romero battles self-doubt, his wife's threats of divorce, and local law enforcement who plan his murder. He confronts an armed gang bent on revenge, skirts federal agents intent on stopping him, and evades the deadly fire of a deranged sniper. Aided by a wise tribal elder, Romero uncovers a tangle of clues that link his cousin's death to trafficking in ancient treasures and a deadly conspiracy that centers him in their crosshairs. Romero combines his combat experience and the fighting skills of his ancestors to dispatch his enemies and protect an ancient secret.