This is the second in Mulberry's Scary Bones the Skeleton series. In this adventure Scary Bones, Sasha and Ben are captured by Captain Cross Bones and those badest of bad pirates, Pillage and Plunder. The pirates sale in the bad ship ‘Naughty Who-saw-us which is made from dinosaur bones. They are after old Captain Grow Bags treasure which is buried on Brownsea Island. How can our brave heroes, helped by the Red String and the island’s Red Squirrels, keep the treasures of Brownsea Island safe for us all to enjoy for ever? The story ends with another sealed envelope not to be opened until the very most end!