When Myles Cabot, inventor of radio transmission of matter, found himself alone on an unknown continent of the planet Venus, he realized that getting back to his old headquarters and his loved ones presented some impossible problems. He'd have to settle a war between primitive natives and an unholy alliance of monsters, dinosaurs and giant insects. He'd have to build an electronic device from raw rocks and untapped resources. And if he succeeded in all that, he'd still have to find his way home
What is the mystery centered in Jupiter's famous "Red Spot"? Two fighting Earthmen, caught by the "Pipe-men" like their vanished comrades, soon find out.
In one place, a descendant of the Vikings rode a ship such as Lief never dreamed of; from another, one of the descendants of the Caesars, and here an Apache rode a steed such as never roamed the plains. But they were warriors all.
With no more room left on Earth, and with Mars hanging up there empty of life, somebody hit on the plan of starting a colony on the Red Planet. It meant changing the habits and physical structure of the immigrants, but that worked out fine. In fact, every possible factor was covered--except one of the flaws of human nature....