About the book:
Welcome to Mermaids Rock! The entrance to the mermaid realm in the deep, blue ocean...
Coralie is overjoyed when she visits a beautiful kelp forest, where she meets adorable sea lions and otters and finds a mysterious treasure map! After telling her friends about it, they're excited to search for the treasure, but when they arrive they find the forest has been destroyed. With no protection from the plants, the animals are in danger, and the friends must do everything they can to save the creatures before it's too late...