Her engagement to Prince Charles is a dream come true for Lady Diana Spencer, but marrying the heir to the throne is not all that it seems. When she discovers a diary written in the 1800s by Princess Charlotte of Wales, a young woman born into a gilded cage so like herself, Diana is drawn into the story of Charlotte's reckless love affairs and fraught relationship with her father, the Prince Regent. As she reads the diary, Diana can see many parallels with her own life and future as Princess of Wales.