Graeme has been hogging the bath and all the bath toys reenacting explorer stories that he's been reading. When he finds a book about a lost Island Paradise, he drags a skeptical Bill and Tim along on an adventure to find it. But someone else who wants to destroy the island and use it to make money has the same idea, and he tries to stop them. The boys soon find out they are dealing with an enemy from their past, who they must defeat in order to save the island and get back to England in one piece.
—E. E. Buchanan