"Join Ethan and Emily Tuttle in their exciting third adventure, as they uncover the curious mystery of how a powerful creature is stealing their grandparents' hard-earned savings, and how the twins are also being controlled by the same creature--without even knowing it! In honor of the classic The creature from Jekyll Island by G. Edward Griffin, this book introduces children to the history and nature of money, banking, inflation, savings, and bartering in an informative and entertaining format that both entertains and excites its young readers!"--Page 4 of cover.