Marcus the Mole isn't very good at being a mole. He spends all day digging and tunneling but he has never found anything, unlike other moles who are busy unearthing valuable treasures! Then one day, he finds a small potato. From then on, he cares for and nurtures his potato. Although it is not as valuable as the other treasures, Marcus still dearly cherishes his potato. But all good things must come to end... Will Marcus be able to cope?