Sylvia is twelve and she wants a horse but a few things are getting in her way. For one, she seems to be stuck in the body of a six-year-old. Sylvia has an undiagnosed medical condition, which makes her very short, with funny ears and strange hands. The kids at school call her Pygmy Chimp. Grandpa has secretly promised to buy her a horse as soon as she grows as tall as his shoulder. Sylvia does everything she can to increase her height, including adhering to an unconventional stretching regime.