Journalist Edward Malone, rejected by the woman he loves because he is too prosaic, decides to go in search of adventure and fame to prove himself worthy of her. Soon after, he meets Professor George Challenger, a scientist who claims to have discovered a 'lost world' populated by pterodactyls and other prehistoric monsters.

    The Reefs of Space brings humanity to the brink of the stars. Steve Ryeland, enslaved by Earth's tyrannical Plan of Man computer, is given the world's most important job—to develop a "jetless drive," an extraordinary new space propulsion mechanism. Yet the most important thing on Steve's mind was not his work, but the iron collar locked securely around his neck. Filled with a lethal charge of explosives, it could be detonated any time the Plan of Man considered him too much of a risk. That's why he had to obey every order, and succeed at his experiments. Only then, perhaps, could he use the jetless drive himself… and escape to the safety of the half-mythical Reefs of Space, strange formations rumored to exist somewhere beyond the orbit of Pluto. But if he failed, the next step would be the Living Body Bank—a scientific horror chamber from which no one ever returned. (1st published in World of IF Science Fiction magazine, 1963)

    When the Terrans came, they found a world of dead sea-bottoms, lost civilizations, and secretive tribes bitterly resenting the intrusion of the Terrans on the fading glory of an ancient planet. The Earthmen looked down upon the crumbling ruins of a brilliant culture, and laughed at the stories of invincible gods and forgotten magic lingering in the forbidden cities of Jekkara, Barrakesh, Valkis ...But the dangers were real--and only a few renegade Earth-born adventurers who had adopted the Martian way of life could understand the planet-wide disaster that was building up.