Max and Chaffy: Hunt for the Pirate's Gold (from the million-selling Jamie Smart, Illustrator of the Year) by Jamie Smart

A treasure hunt and a secret cove are adventure enough, so imagine Max and Chaffy's delight when they discover a Puffa-Chaffy, who can blow bubbles that allow them to go on an undersea adventure that leads them to . . . GOLD!
Binding: Paperback / softback