The ocean is dying. A mermaid vows to save it. The Mers are barely surviving in a magical marine bubble, isolated from the rest of the world. Jelly, warrior mermaid and champion of sea life, battles against the choking, accelerating pollution, living beneath the Great Pacific Garbage Patch. When Jelly's mind opens to terrifying premonitions, she must leave the ocean, collaborating with estranged magical beings on land. She's seen one of theirs in a vision, a woman abducted for the power in her veins, and Jelly is the key to this woman's freedom. The black pearl at Jelly's throat holds a secret. When it wakes, it sends Jelly on a tumultuous journey, changing her life forever.