riptide

A gemstone necklace discovered in a jar of seashell. A young boy drowning in the ocean, sucked in by a storm. Four girls come together to save the life of the boy, whilst one of them wears the necklace. In the ocean, the necklace emits a blinding blue light. The storm ceases. They soon find out that the gemstone has transformed them into something they could never have imagained-mermaids. And now it's up to them to protect their town of Castlelea against a great darkness that wishes to consume their powers.