This is the story of Kathleen Kennedy and her struggle to live her own life her own way, in spite of enormous pressures from her parents and the rest of the clan. She first went to England in 1938 when her father, Joseph P. Kennedy, became the Ambassador to the Court of St. James. She made her debut that year and was selected as the most popular debutante of the season. Her story falls into two parts: her forbidden marriage to the Marquis of Hartington, son of the Duke and Duchess of Devonshire; and her fatal affair with Earl Peter Fitzwilliam, one of the wealthiest men in Britain, who was already married to the heiress of the Guiness Fortune. Through World War II, and a few of the post-war years, we watch the tragedy unfold.