From The Backcover of the 1979 Magnum edition
He-had a moment of shattering terror. One minute he'd been driving along the familiar road to his city office, next he was hurled centuries into the future. In seconds he had traversed centuries. But why had the tribesmen of the Wolf chosen him for such a grimly dangerous task? Could he -alone in a future world- tamper with the threads of destiny? Above all, was there a chance lhat he could escape the frightening future and rmd his way back to his own time?