In the depths of Oceania’s hidden seas, Princess Selene was once a child who believed in the beauty of all living things—until humans took her father’s life and poisoned her people’s waters. Now, confined to her kingdom by a mother’s fear and haunted by memories of loss, her heart burns with a single purpose: revenge. While humans roam freely even in mer-territory, her kind cowers in fear. But Selene knows they are not the only ones with teeth and claws. When she finally breaks free, every human who crosses her path will learn that the ocean’s wrath is deeper than its depths—and that the pain they inflicted will be returned tenfold.