Family problems, first loves, new friends, and secret magical powers; being a teenager is already complicated enough for Rikki, Cleo, and Emma. But when the girls encounter a pod of real mermaids, their lives are once again turned upside down. With the help of a few new friends, the girls must take on the ruthless pod leader before she can wage a war on everything they hold dear.

Jack and Ben have met their fair share of odd and strange things...But three teenage girls who change into mermaids are a definite first for them. Follow these twins as they embark on a new adventure in Dolphin City where once again, they must try to keep the knowledge they hold of the show from the characters, but how will it go when everyone seems to think they're ghosts?