Reality twisted... slightly. Earth shivered. For a split second the Solar System wasn't. And then was again. Less than a billionth of a second - but a time shift had nonetheless happened. As the shadow ship started to emerge from the time jump, men and aliens were locked in a secret, undeclared war for control of the Earth. Genetically altered, the aliens looked exactly like humans. And they were in positions of power everywhere. Opposing them were two humans and one isolated brain in a mechanical body. But between them they held the one secret that the aliens had never learned about the people of Earth.... It was also published by DAW Books as "Earth Factor X". It is partly based upon the short story "The Sound of Wild Laughter".
Author
Alfred Elton van Vogt was a Canadian-born science fiction author regarded by some as one of the most popular and complex science fiction writers of the mid-twentieth century—the "Golden Age" of the genre. van Vogt was born to Russian Mennonite family. Until he was four years old, van Vogt and his family spoke only a dialect of Low German in the home. He began his writing career with 'true story' romances, but then moved to writing science fiction, a field he identified with. His first story was Black Destroyer, that appeared as the front cover story for the July 1939 edtion of the popular "Astounding Science Fiction" magazine.
