Masters of Space
Author: first_name:  Edward Everett
last_name: Evans
first_name: E. E.
last_name: Smith
Language: English
Year: 1961

The Masters had ruled all space with an unconquerable iron fist. But the Masters were gone. And this new, young race who came now to take their place—could they hope to defeat the ancient Enemy of All? - Summary from Gutenberg text