When a drug overdose causes Leoni, a troubled teen from twenty-first-century Los Angeles, to have a near-death experience, her soul is lifted from the modern world and flung into a parallel time 24,000 years in the past. There her fate becomes entangled with that of Ria, a young Stone Age woman fighting for her life against the ferocious Illimani, an army of evil led by the vicious Sulpa, a powerful demon determined to destroy humanity. As the invaders annihilate Ria's people, inflicting torture and human sacrifice, Sulpa moves ever closer to his ultimate goal: to manifest physically in the twenty-first century and condemn all of mankind to perpetual slavery.