The Closed Worlds
New York : Ace Books, 1968
157 p. ; 18 cm. – (Ace Books ; G-701) pbk. $0.50
Cover: Jack Gaughan
“On the forbidden planets of Allubane, Morgan Chane found an ancient science-secret that spelled doom for mankind” — Cover
THESE WORLDS ARE FORBIDDEN!
When Morgan Chane and his comrades of John Dilullo’s interstellar mercenaries invaded the Closed World of Arkuu in search of a lost Terran expedition, they found a planet of strange menace.
Incredibly powerful monsters prowled through Arkuu’s dense jungles, and the ghosts of the planet’s past haunted its ancient deserted cities. The Arkuuns themselves fought grimly to drive the Terrans away.
But at last chance discovered the Free-faring, the terrible alien secret of Arkuu … and suddenly he knew why no Terran had ever left the Closed Worlds alive.