Kalora is the "slim princess of Morevana," a land in which fat is prized. This distresses her family, who must marry off Kalora, before her rotund younger sister Papova may wed. To remedy this situation, Kalora's father, the governor general, throws a garden party and disguises his slim daughter in an inflated rubber suit. All goes well until the suit ruptures, deflating Kalora to her normal size. Soon after, she meets Pike, an American, and falls in love. Upon hearing of a cure for slimness in America, the governor sends Kalora overseas where she meets Pike again. He follows her home to Morevana, and once it is discovered that he is wealthy, the governor offers the American his prized daughter Papova, only to discover that it is the slim princess whom Pike treasures.