The Adversary

In the final novel of the award-winning sci-fi saga, both humans and aliens face destruction as a new time-portal opens a path back to the twenty-second century.

Human time-travelers from the sophisticated Galactic Milieu of the twenty-second century came to the Pliocene Epoch seeking a Garden of Eden. What they found was slavery under the knightly Tanu race, who had been exiled to Earth from a far galaxy. Freed by the usurper Aiken Drum, the humans enjoy a brief period of dominance. But no...