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On the Gold Coast of Australia, four girls who could not be more different are thrown together after an unexpected night near Mako Island. Cleo and Emma have always been close, while Rikki has built a reputation as a troublemaker. Y/n, meanwhile, is one of the most popular girls on the Gold Coast. Although the four grew up around each other, different cliques kept them from ever becoming truly close. After a stolen boat, a ruined party, and an embarrassing betrayal involving Nate, Y/n leaves everything behind and joins Cleo, Emma, and Rikki on the water. Their journey takes an unexpected turn when they become stranded near Mako Island and discover a mysterious cave hidden deep within the island. What happens inside the cave changes everything. The next morning, each girl discovers the impossible: water transforms their legs into shimmering orange mermaid tails. Now Cleo, Emma, Rikki, and Y/n have to keep their secret hidden while figuring out what happened to them, learning to control their new abilities, and navigating friendships, school, parties, romance, and the strange connection between themselves and Mako Island. Four girls. One secret. A whole new world beneath the surface.