In life, Jackie and Lee were alike in so many ways. Both women had a keen eye for beauty' in fashion, design, painting, music, dance, sculpture, poetry' and both were talented artists. Both loved pre-revolutionary Russian culture, and the blinding sunlight, calm seas, and ancient olive groves of Greece. Both loved the siren call of the Atlantic, sharing sweet, early memories of swimming with the rakish father they adored, Jack Vernou Bouvier, at his East Hampton retreat. But Jackie was her father's favorite, and Lee, her mother's. One would grow to become the most iconic woman of her time, while the other lived in her shadow. As they grew up, the two sisters developed an extremely close relationship threaded with rivalry, jealousy, and competition. Yet it was probably the most important relationship of their lives. Drawing on new information and extensive interviews with Lee, now eighty-four, this dual biography sheds light on the public and private lives of two extraordinary women who lived through immense tragedy in enormous glamour.