Coming from the future, our children's children walked through holes in the air. The holes were time tunnels and down them were fleeing our after-generations, escaping from an invasion of intelligent... This description may be from another edition of this product.
Our descendants from 500 years in the future have to leave their own time frame because earth has been invaded by creatures which are systematically wiping out the population. Gale the leader states that the whole population of 3 billion people will be travelling through timegates to temporarily settle in the present day. They then plan to build new timegates which will carry them back to the Miocene era so they will not upset the natural evolution of man. The rush is on to get everyone through as soon as possible because the threat of one of the aliens arriving through time would be catastrophic because of their fast breeding cycle. One creature gets through and the chase is on to destroy it before it breeds. Simak creates a believable situation in regard to how our politicians and religious leaders react to the invasion from the future. This was a thoroughly enjoyable book and if the subject of time travel is your genre then I suggest you check this book out
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