"Mansfield Park" by Jane Austen is about a poor young girl, Fanny Price, who is sent to live with her wealthy relatives, the Bertrams, at their estate called Mansfield Park. Despite being treated harshly, Fanny remains grateful and develops a deep attachment for her cousin Edmund. The book explores themes of morality, class differences, and family dynamics - all seen through Fanny's perspective. Ultimately, Fanny's good nature triumphs as she maintains her integrity and finds love and acceptance.