Mahalia Mouse and her family live underneath Dunster House, an old Harvard dormitory. Foraging for food for her younger brothers and sisters, Mahalia gets trapped in a backpack and then finds herself inside a classroom far from home. Mahalia, intrigued by the lecture, starts attending classes and soon becomes a full-time student -- all the while wondering about the fate of her family. But when graduation day finally arrives, Mahalia has a wonderful surprise waiting for her.