Damon Knight 
Reasonable World [EPUB ebook] 
CV Book 3

Plague…or paradise? 2005 A.D. Six years have passed since the alien Symbionts invaded Sea Venture, Earth’s largest ocean habitat. Now, despite the government’s best attempts at quarantine, the Symbionts have spread all over the planet, infecting the bodies of both humans and animals — and slowly, subtly forcing mankind in new directions. Once possessed by the Symbionts, men and women become smarter, wiser — or else they die. War and violence are punished by instant execution from within. A new era dawns, but there are those who would turn back the millennium, who will stop at nothing to prevent…A Reasonable World.