The fourth and final volume of The Saga of Pliocene Exile. Until the arrival of Aiken Drum, the 100,000 humans who had fled backward in time to Pliocene exile on Earth knew little but slavery to the Tanu -- the humanoid aliens who came from another galaxy. But King Aiken's rule is precarious, for the Tanu's twisted bretheren are secretly maneuvering to bring about his downfall. Worse -- Aiken is about to confront a man of incredibly powerful Talents who nearly overthrew a galactic rule. He is Marc Remillard. Call him . . . The Adversary.Julian May is the author of 'The Adversary (Saga of Pliocene Exile, No 4)', published 1985 under ISBN 9780345314222 and ISBN 0345314220.