Nothing exciting ever happens to Mani. She lives in a small city under a dome, at the bottom of the sea. She's been told her whole life that no one is able to live on the land above since the Great Wars, but one day, a man named Uncle Jock visits and turns her world upside down. On the run with her parents, Mani meets an extraordinary creature, new family, and a secret identity that will change the way she looks at herself. Will she be brave enough to go on the most important mission of her life?