They were four trained scientists, each of them skilled in several disciplines - because this was an opportunity that would never occur again. There would never be another chance for men form the world of 2070 A.D. to examine in person the world of 12,000 B.C. What they learned and taped would be the only record ever made of this dim, enigmatic period of prehistory. But absolutely no one in the world of 2070 or in the borrowed time of 12,000 B.C. could have imagined what the tapes would reveal...

A superb novel of adventure and intrigue in a vanished era

Cover illustration: Geoff Cummings