Over 5300 years ago, a Neolithic clan settled near a creek. While their leader Kelab is hunting, the settlement is attacked, and the tribe is brutally murdered, amongst them Kelab's wife and son. His infant son is missing. He sets out after the murderers on what turns into a grand odyssey where he must fight constantly, for the infant's survival; against the forces of nature; against hunters; the loneliness of the quest, and the growing sense of doubt over the morality' of his mission.