Man's far future descendants are primitive, earth-bound people, preyed upon by silver-clad beings who descend from the sky. Berry, chief of the nomadic Londos clan, devises a defensive strategy to protect his people from the Night Comers. But the gleaming giants are indifferent to Berry's fiercest warriors with their arrows and carry off Londos women as they always have, effortlessly. Furious with frustration and doomed to disgrace and death at the hands of his disappointed tribe anyway, Berry recklessly pursues the Night Corners and finds a giant tower is, of course, though Berry Doesn't recognize it, a space vehicle--and it seizes Berry and takes him to a world of technological complexity and social sophistication beyond his wildest imaginings. It is a world that despises his crudeness and determines to kill him since he won't be submissive. But it is a decadent world, and Berry's resourcefulness and deadly skills enable the primitive man to run a world-spanning chase for his life--and for the existence both of the Night Comer's world and his own earth as well.