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illy skylarking schoolgirls Cleo, Emma and Ricki get caught in a cave on 'moon island' Mako. Before they can swim away, the moon lights them up at night. Back on land, they find that each will, when wet, quickly transform temporarily into a fish-tail mermaid. They dare not tell anyone, not even nerdy tutor Lewis McCartney. Two even discover they now have a magical control over bodies of water.

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