Billy Buckhorn, aka Thunder Child, battles the Owl Clan and the Serpent Society when they renew their ancient evil alliance. First, they launch a series of supernatural events meant to usher in a new age of horrific Underworld dominance. Next, bizarre weather patterns produce raging floods, and fantastic beasts from Native American legends roam North America once again. Worst of all, the Snake Priest, riding the ancient and malevolent Winged Serpent, rises from the deepest regions below to exact revenge and take control of everyone and everything in the Middleworld! Can Billy and his dedicated, gifted team—his oldest friend Chigger; Osage girlfriend, Lisa; the Intertribal Medicine Council; and his allies in the Upperworld—prevent this apocalypse from happening?