Hard SF by the author of Rocheworld and his daughter. When the first interstellar expedition reached Barnard's Star, explorers found a bizarre double planet populated by hyperintelligent water-dwellers. Soon a new aquatic race is discovered--intelligent but unfriendly beings whose territorial instincts make them attack any creature that intrudes on their domain.
Original title: Return to Rocheworld
Genre: Fiction→ Science Fiction→ Adventure→ Lost Worlds and Colonies