Didn't Sea it Coming

The tides are changing in Withernsea. Shelley's adoptive parents make waves after they catch their daughter, Polly, with Drake Lord, a royal of the sea. Holding Shelley responsible for the supernatural world invading their lives once more, they demand she splits them up or else they’ll expose the supernaturals of Withernsea to the rest of the world. The residents of the sea aren't keen on a human dating their royal either, especially a sea nymph intent on hooking Drake for herself. Can Shelley intervene so that Polly and Drake can make love, not war?