When things go horribly wrong for eight-year- old Aloha as his family is leaving from vacation on Siesta Key, he finds himself alone and scared. That is, until a dolphin named Mari shows up and speaks to him, changing his life forever. Just as he discovers his powers as Tide Swooner, protector of the sea, trouble arises. Aloha is whisked along on an adventure that will ultimately lead to his destiny: a battle with a fiendish beast rumored to be the source of all evil.