Lilly Prospero And The Mermaid's Curse - The Lilly Prospero Series, #2

Lilly Prospero And The Mermaid's Curseby JJ Barnes?????Lilly Prospero And The Mermaid's Curse is the second book in The Lilly Prospero Series by JJ Barnes. When fifteen year old Lilly and her best friend Saffron go o a family holiday to Whitstable, they plan on relaxing and having fun together on the beach. But when they meet mermaid's in distress, they realise that won't happen. Mermaids are being pulled from the sea and harvested for their body parts to sell on the magical black market, so Lilly and Saffron team up with a coven of mysterious elderly witches to stop him.
But soon, they discover the issue is more complicated than they ever realised, and they must risk the lives of both themselves and everyone around them if they have any chance of saving the mermaids.