Coralie is overjoyed when she visits a beautiful kelp forest with her pet dolphin, Dash. She meets adorable sea lions and otters, and she even finds a mysterious treasure map! After telling her friends about it, they're excited to help her search for the treasure. But when they arrive in the kelp forest, they find that it has been destroyed. Without the plants for protection, the animals that live there are in danger--and the friends must do everything they can to save the sea creatures before it's too late....

Join Coralie, Marina, and their mermaid friends in the beautiful coral reef at Mermaids Rock! Whether they're working together to help sea animals in danger or solving a mystery of the deep, the friends at Mermaids Rock will do anything to protect their ocean home and if there is a ripple of adventure they will find it!