When Lana and her father return to their seaside hometown to help clear the debris of a storm, the last thing she expects is to discover a colony of Aquicorns—magical seahorse-like residents of the coral reef. As she explores the damaged town and the fabled undersea palace, Lana learns that while she cannot always count on adults to be the guardians she needs, she herself is capable of finding the strength to protect both the ocean, and her own happiness.