After the sudden suspicious death of their father in San Diego, fifteen-year-old Billy and his little sister Susie set out on a very unusual and exciting adventure with their mother. Headed for their grandfather's ranch in South Dakota, they experience terrifying danger, supernatural entities determined to stop them, and Native American mysticism and magic. Discovering intimate ties with the local Sioux Indian tribe, they find they have inherited powers that may ultimately decide the fate of humanity. Facing racism, Indian mistreatment, government corruption, and corporate greed, Billy will confront the epitome of Evil alone. Will his newly discovered powers be enough to save his family and his people?