Twelve-year-old Jo Moonstone has never ridden a giant seahorse. She’s never had to fight a mega shark. All Jo wanted to do was stay home with her great aunt Ellie and pretend she isn’t different. Everything changes one stormy night when a lightning-flinging villain attacks Jo’s home. Now Jo has one chance to keep her great aunt safe. Journey to the underwater city of Atlantis. There, Jo and her team of misfit friends must use their emerging, supernatural gifts to beat the supervillain to the powerful Atlantis Diamond, hidden deep in the lair of a terrifying half-dragon, half-octopus sea monster. Will Jo find the courage to believe in herself and save Atlantis, the Earth, and, ultimately, her own destiny?