Author(s): Sue Mongredien Illustrated by Maria Pearson
Far out in the ocean live the Shell-Keeper mermaids. While the rest of the world sleeps, secret mermaid Molly must help her mermaid friend Delphi to find the second piece of the enchanted conch shell in time to prevent a terrible oil spill. Unfortunately, Delphi's shell is guarded by a spiky sea urchin, and the only way they can tempt it away is by bringing it some treasure from a spooky shipwreck, where a great white shark lurks, ready to attack. Can they save the day with the help of some humpback whales? The third book in this magical mermaid series.