Intrigue, adventure, and octopi await! On the eve of war between Earth and Jupiter, one brave tabby cat embarks on a journey that will rock the foundation of her world as she travels between the depths of the sea and the depths of space. While Kipper seeks an audience with the octopus oligarchy, her sister Petra struggles against tyrannies and conspiracies among the dog and cat government of the Uplifted States. Meanwhile, across the solar system, the otter Jenny leads her team of pirates and scientists as they try to uncover the secrets of the ancient, abandoned Europa base. Can the creatures of Earth, working together, stop the Jovian fleet in time?