Molly returns to the Undersea Kingdom to help Animal-Keeper mermaid Leila find the missing whales.
When they investigate they find the whales trapped inside a lobster pot but before they can set the whales free Molly and Leila are attacked by the Dark Queen's menacing mud monsters.
- Format: Paperback
- Pages: 96 pages, Illustrations
- Publisher: Usborne Publishing Ltd
- Publication Date: 25/06/2010
- Category: Fantasy
- ISBN: 9781409506393