First published 1959
The Pluto colony teeters on the brink of doom. Earth Satellite Base offers their only hope - but the planet below holds dark, alien forces that kidnap humans for twisted experiments. As the colonists make a desperate bid for survival, they must confront the true menace from Earth and decide the fate of two worlds.
Genres: science-fiction, adventure, action, aliens
Vibes: fast-paced, suspenseful, thought-provoking
Tropes: enemies-to-lovers, found-family
Setting: Earth, Pluto
Period: 20th-century
278 pages · Paperback · Baen
Content warnings: kidnapping