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Merlinda’s coming-of-age celebration is disrupted when an ancient force tests her courage and a dangerous enemy threatens all of Mertropia.

Back in Morton Bay, the mermaids help Celia through a surprising change - until an old enemy turns an ordinary school day into a dangerous showdown.

Merlinda and her friends enter the Morton Bay Regatta, racing above and below the waves toward a magical secret with the power to restore Mertropia.

As the search for Jelly goes on, a new lead brings Merlinda and her friends closer to the Sea Witch, only to land them in a dangerous trap.

The Sea Witch pulls Merlinda into an ancient vault beneath the waves. As her friends race to help, Merlinda searches the darkness for a way out.