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

The Carver family are out in space, travelling to new worlds to check them out for colonization. But, when Mr. Carver has an accident, and remains out of commission for the trip, his sons, Jon and Jak, step up and take over their trip. The boys use their different talents to make their journey a successful one!