In Cockleshell Cove there is mischief and adventure in the water!

As Pearl and her best friends Shell, Coral and Sandy discover their secret powers and learn to use them, they leave no starfish unturned in order to solve four undersea mysteries.

A hungry reef dragon, a confused giant turtle, a thieving rainbow fish and the mysterious Count Frumplesquid are no match for these sea-sational super-sleuths.

Four fully illustrated adventures, full of laughs and heart, perfect for young readers.

Includes the first four Mertales books in one great box: The Best Friend Promise, The Daring Reef Rescue, The Great Treasure Hunt and The Mysterious Rainbow Thief.