Time Traders/Ross Murdock

When desperate measures failed to control what men had begun and could not stop, they fled their polluted planet, leaving behind an epidemic virus born of experimentation. Yet unlike men, whom the disease could destroy, the animals of the planet thrived. Each generation was more forceful and intelligent than the last.

In the ruins of what was once a university complex, a vast band of The People, more highly evolved than those on the outside, sought to master the works of men. And they learned that the demons (as men were called) were not legendary but real. Then one day a spaceship landed...

Fors was a mutant. He did not know what drove him to explore the empty lands to the north, where the great skeleton ruins of the old civilization rusted away in the wreckage of mankind's hopes.
But he could not resist the urging that led him through danger and adventure, to the place where he faced the menace of the Star Men.

Two centuries after an atomic war on earth, a silver-haired mutant sets out on a dangerous search for a lost city of the ruined civilization.

Left homeless by the war that reduced Terra to a radioactive cinder, Hosteen Storm – Navaho commando and master of beasts – is drawn to the planet Arzor, to kill a man he has never met. On that dangerous frontier world, aliens and human colonists share the land in an uneasy truce. But something is upsetting the balance, and Storm is caught in the middle. He had thought the war was over – but was it? “Miss Norton endows this story of a homeless, revenge-driven man with her own inimitable touch. The result is a compelling and compassionate tale.” – The New York Times Book Review

The big cat cried "danger!" Troy Horan heard it with his mind just as he had heard the fox's warning and the kinkajou's. He didn't understand how he could communicate with the animals or why they were contacting him. But from the moment he began work at Kyger's pet emporium on Korwar he was enmeshed in a perilous intrigue... an intrigue that would leave more than one man dead, an entire government in jeopardy, and Horan himself both master and captive of the most extraordinary band of warriors his world had ever known.

Of all the justly famous writers of science fiction and fantasy, none has inspired greater enthusiasm and loyalty than Andre Norton. Of all Ms. Norton's works, none has been more warmly received than her famed "Forerunner" series, a series whose heroes and heroines have already taken on the trappings of legend.