"The Princess Diaries" is a young adult novel by Meg Cabot that follows the life of Mia Thermopolis, a teenager who discovers she is the heir to the throne of the fictional European country of Genovia. As she navigates the challenges of adolescence, Mia must also learn how to embrace her royal identity while dealing with the pressures of high school. The story explores themes of self-acceptance, friendship, and the importance of family. It has been adapted into a successful film series, starring Anne Hathaway as Mia and Julie Andrews as her grandmother, Queen Clarisse Renaldi. The narrative combines humor and heartfelt moments, making it a beloved tale for readers of all ages.