Pugwash and the Buried Treasure by John Ryan
Poor old Captain Pugwash's worst nightmare comes true when he is marooned on an island in the middle of the ocean. But even worse than that, he is not alone - and his fellow inhabitant is none other then his most deadly enemy, the villainous Cut-throat Jake. All seems lost. But, as usual, quick-witted cabin boy Tom saves the day and the captain and his crew end up sitting on a fortune!