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When fourteen year old Madison gets invited to stay in the coastal town of Seahorse Bay with her aunt and uncle, she can hardly hold in her excitement. She has always wanted to be near the ocean. She is introduced to siblings Dylan and Marin, who soon become her closest friends.

One evening after spending all day having fun swimming at the beach, the two girls get the shock of their lives! They find out they are mermaids! Then the two girls find out that each of their families are mer-folk.

Little do the adults know, that the very next day, while Dylan takes the two girls to try out their 'new tails', the teens would find themselves caught up in an exciting underwater adventure of danger, secret plots, hidden cave passages, midnight meetings and some unexpected surprises, while exploring the The Great Barrier Reef and its underwater city (Barrier City). Dylan gets kidnapped, they all get trapped, and there are two hench-fish called Spike and Claw after them! All because King Neptune lost his Trident!