They had built Utopia on Earth at last. Ten thousand years in the making ... They built it on a platform that covered the polluted surface of the old world, turned men's eyes away from the unsolved problems of the bad old days, and brought their shining new cities up into the perpetual sunlight.
But down there, in the laplit "sky" of the old surface, life had persisted. Men existed, and semi-men, and things that never were men ... and nobody in the sunlight above knew about them - until disturbing dreams began to intrude and visions bothered a few sensitive minds.
One man investigated. One man went down to that forgotten basement of the Earth and thereby uncovered the grove of the world that was - and let its transformed phantoms glimpse the light above.
A TRIPLE NOVEL UNLIKE ANY EVER WRITTEN BEFORE
By the gloom of electric lights, stunted and misshapen beasts scrabble for their lives in blasted landscapes of poisoned canals and grotesque vegetation. But this is no alien world. This is Earth, or used to be.
Now it is Tartarus, shut off from the face of heaven, from the sky and the stars, by a huge platform which completely envelopes the world. Living in a technological utopia, the inhabitants of the platform have long forgotten that other men still live in the grim underworld that they abandoned.
But one man descends to the depths. He discovers that under the accelerated evolutionary conditions of this hothouse underworld a whole new ecology of grossly mutated life-forms has emerged. now the True Men share their environment with rat-men, cat-men, and gigantic waterworms ,,,,