Return To Rocheworld

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.
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.