Poor Penelope. She desperately wants to be a doctor. She has everything she needs - a lab coat, a medical bag and even an identification badge! But Penelope's friends are growing weary of her constant ministration, and one afternoon a discouraged Penelope finds herself without a patient in sight. Fortunately Ms. Brisco, the librarian, knows just how to help. Over the next few days, Ms. Brisco introduces Penelope to a world of doctoring that she never imagined. In all corners of the library, there are books that need care. Some are smudged with dirt, some have torn or dog-eared pages and some are bent and crumpled. One has even been chewed! Penelope immediately turns her attention to learning how to mend mishandled books. She listens closely. She trains hard. And when the moment suddenly comes for her to save a "patient" all on her own, Penelope Popper, Book Doctor is ready! In this charming story about the importance of book care, one small girl rises to great heights as she learns to heal her library, one book at a time.