In , outlaw with a conscience Jess Galvan made a devil's bargain with El Cucuy, a fearsome, five-hundred-year-old Aztec priest and crime kingpin determined to bring about hell on earth. Now, months later, Galvan's mind is infested by the ancient monster. No longer able to trust his own judgment, he is estranged from his daughter, Sherry—and from his own body. But Cucuy's presence has endowed Galvan with superhuman abilities. Meanwhile, shell-shocked from her confrontation with Cucuy, Sherry is living with Sheriff Bob Nichols and his girlfriend, psychologist Ruth Cantwell. And in the bowels of Ojos Negros prison, a territory once controlled by the ancient priest, the drug cartels are at war with one another and on the hunt for Galvan.