It's only a few days into the half-term holidays and Barry's dad has already had enough of him! He's packing Barry off to Pirate Camp, the same one he used to be sent to every year.

Barry's not impressed - he's not a baby anymore, so why should he have to go to a camp for kiddywinkles? But horrible things are afoot at Pirate Camp - it's been taken over by the villainous Morag, and now its future's in doubt. There's only one thing to do: Barry and his new friends Sally Bottom and Renard Dupont have to uncover the hidden treasure of Mogden Island ...