Having just moved to Dolphin City, Lance Carter slowly finds his place in his new home, starting with his first day where he meets a girl named Rikki Chadwick.
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.