The novel follows the adventures of a group of scientists and adventurers who are sent to explore a mysterious planet called Mentale. The planet is home to a strange race of aliens, the Mentales, who possess powerful mental abilities. The group soon discovers that the Mentales are engaged in a war with a powerful enemy, and they must use their own mental powers to help the Mentales survive. The novel is set in a future where humanity has spread out to the stars, and is a classic example of the "space opera" genre. It features a mix of action, adventure, and science fiction elements, as the group battles against the forces of evil and discovers the secrets of the Mentales.
By Randall Garrett · First published 1956 · Genre: Science Fiction, Mystery, Thriller · 8 chapters