20-year-old Piper has never fallen in love before but that all changes when she finds the merman Adrien unconscious on the beach near her house. Determined to help him get home the two of them embark on a dangerous journey to get Adrien back the city of Atlantis. But on their way they must battel the ocean and a evil corporation who want to use Adrien and the other mermaids for their nefarious agenda