Book 1, The Little Piggy Bank, begins right at the beginning. As readers follow the financial adventures of twins, Tessa and Benji, they learn what money is both physically and practically. They observe that people receive money in exchange for work or sometimes receive money as a gift. Money can be used right away or it can be saved for spending later. The readers learn that money comes in paper and coin format. They are also introduced to the concept of storing money in a piggy bank to keep it safe in one place - ready for future use.