- 1959: Science Fiction Adventures [UK] #10, October 1959, Magazine
- 1963: The Silent Invaders/Battle for Venus, Ace Mass market paperback, 221 pp.
- 1973: The Silent Invaders, Ace Mass market paperback, ISBN 441-76390, 152 pp.
- 1975: Silent Invaders, Dobson Hard cover book, ISBN 0234770023
- 1977: The Silent Invaders, Ace Mass market paperback, 152 pp.
- 1978: The Silent Invaders, Hamlyn Mass market paperback, ISBN 0-600-38297-4, 152 pp.
- 1985: The Silent Invaders, Tor Mass market paperback, 216 pp.
(from Hamlyn 1978)
Abner Harris was sent to Earth on a mission of extreme urgency. The universe was in danger of enslavement by the Medlins, and the fight against them called for Harris to assume the disguise of a flesh-and-blood Earthman.
But he discovered that the real villains of space were not the Medlins or the people of Earth: they were his own kind.
Suddenly he was alone, alienated from his own race, hated by the Medlins, and an imposter on Earth. No matter what side he chose he'd be a traitor.
Yet choose he must...or forever remain a man without a planet.
[None on record]