New York: World Editions, Inc, (1951). First edition - The first printing of this early novel by a Hugo and Nebula award winning writer - a rewrite of a novel originally written by John W. Campbell, Jr. - a story of Interplanetary intrigue and revolution resulting from conflict between the inventors of a new, cheap energy source, one of whom is determined that it shall be used to establish his empire, the other who feels it should be free to all. An original publication of Galaxy Science Fiction novels. Cover price of 35c. 160 pp.