C. L. Moore and Henry Kuttner’s 1950 Fury—often but incorrectly credited to Kuttner alone — is the second in their Keeps science fiction series1.
By the twenty-seventh century, Earth’s atomic death is six centuries in the past. Humanity survived only because Venus was at hand to provide a second life-bearing home. Because the continents teemed with life that 21st century humans were not equipped to survive, let alone dominate, humans are confined to the subsea Keeps, which no Venusian lifeform can penetrate.
Life in the Keeps is tolerable and stagnant. Ruled by Immortal mutants such as the Harkers, society might have been fated to continue its long decline into decadence, save for an act of spite by a grieving father.