Huemac, a half-breed, covets ultimate power, but he needs two things—access to the royal family and an ancient artifact. He attains the former by seducing the Emperor's sister, and then steals the latter. Moctezuma, the newly crowned Emperor, comes from a long line of powerful gods known as Sin-Eaters. He desires peace among his people, but an ancient prophecy warns of war. Huemac discovers the incantation to activate the fabled Athame of Souls, a mythical weapon capable of entrapping souls. His quest to rule is within his grasp. Only one thing stands in his way—Moctezuma.