Poul Anderson 
Orion Shall Rise 

Centuries after a worldwide nuclear war has decimated Earth’s population and devastated the land, four opposing pockets of civilisation vie for control of the planet — and of the precious resources that survived the destruction.Nothing less than the future of Mankind is at stake . . .A novel of politics and people, adventure and passion, of worlds real and imagined, ORION SHALL RISE is a powerful and utterly enthralling speculation on our global destiny — and a gripping story as only Poul Anderson could write it.