This is the story of three boys, Knucklehead, Bent-Arm, and Thighbone. They live in the stone age, maybe 500,000, years ago. They invent several things that will be useful to the tribe, now and in the future. To be a man each of the boys must go on a Spirit Quest, successfuly hunt large game, and bring it back to the tribe. Later they will have families of their own and may become tribal leaders. Everything they invent or do has been invented and done in real life -- just not by them, and most of it could, or can, be done by you if you live or visit the country.