Nan Prince is an orphan who becomes the ward of the local general practitioner, Dr. Leslie, upon the death of her elderly aunt. Nan and Dr. Leslie develop a close emotional bond. She is a bright young woman who enjoys accompanying him during his long day's work as a country doctor in Oldfields. They often discuss medicine and healing. Dr. Leslie encourages Nan to read medical books, while instilling in her an understanding of the intimacies of his patients' lives and a love of caring for them. He would like to see her become a physician, an ambition she soon begins to pursue despite many obstacles. She goes away to medical school in the city.