The Acre was the only part of an entire world where Earthmen were allowed to live as they pleased and as they were accustomed. For elsewhere on Quallavarra, humanity was forced into servitude by the Vorra, THE SUPER BARBARIANS who had somehow managed to conquer space.

But within the Acre, the underling Terrestrials had cooked up a neat method of keeping their conquerors from stamping them out altogether. They had uncovered a diabolical Earth secret that the Vorra couldn't abide - and yet couldn't do without.

© 1962 by Ace Books Inc

"Spaceships in thousands, and they're attacking us! They've come from somewhere toward our galaxy - have come out of intergalactic space itself to attack our universe!"

The Interstellar Patrol, that fabulous fleet manned by all the assorted races of our galaxy, faced its greatest struggle when that alarm came through. For this was an attack from OUTSIDE THE UNIVERSE, a vast migration from another galaxy, and it had to be stopped if a thousand worlds were to survive!

This terrific classic space novel on the grandest scale involves three giant galaxies in an all-out conflict.

© 1964 by Edmond Hamilton