This book is the sequel to Andorra Man and is the second in the series. John, Julie, and the kids have escaped the world of the twenty-second century to make a new life for themselves near the famous Olduvai Gorge in northern Tanzania 150,000 years in the past. There, they hope to live a peaceful existence without the personal dangers that exist back home. Events, of course, always seem to have a way of conspiring against you, and in Olduvai Man, this is certainly the case.