Fleeing a carnivorous race of alien monsters, the entire surviving human population from five hundred years in the future escapes into the present in this thrilling science fiction adventure from one of the Golden Age greats
Our human descendants from five centuries in the future are coming to visit—all one billion of them—arriving via tunnels through time. Even though the present is merely a stopover and their ultimate destination is the age of the dinosaurs, their arrival has caused a worldwide uproar. Some folks want them gone and some want to go with them, as governments and powerful corporations alike scheme to get their hands on remarkable, potentially profitable time travel technology. There is a dark and terrifying reason, however, for the visitors' abrupt arrival. Our frightened descendants are seeking sanctuary from carnivorous aliens who have descended upon the future Earth, a threat that could mean the rapid destruction of the entire human...