This epic begins in England where Kiron Griffith, an American graduate student at Cambridge University, makes the staggering discovery that inherited fossil memory causes him to experience life alternatively in two widely-apart times and as a man in today's England...and as a woman ancestor in Africa's primeval past. As a woman Kiron lives in a cave as a member of a matriarch-led clan of African hunter gathers from which she eventually flees to lead a polyandrous life with two mates of her own, each man of a different race. She is challenged to make fire, re-invents pottery, the bow and arrow, and makes an iron knife from meteor fragment. She is captured by pygmies and later raises a cheetah as a friend and hunting ally Eventually alone and defenseless she must give birth on the open savanna surrounded by hyenas which water instinctively for her moment of greatest vulnerability.