Few bonds are as deep and complex as the one between sisters. Never was that truth born out more than in the story of Jacqueline Bouvier Kennedy Onassis and her sister, Lee Bouvier Radziwill. Quiet, bookish Jackie and beautiful, vivacious Lee grew up in a world of refined privilege, and were close friends in spite of their differences. In 1959, Lee's marriage to a European aristocrat made her a princess. But in 1960, Jackie's marriage to John F. Kennedy made her first lady—and one of the most famous women in the world. Soon Jackie's celebrity eclipsed Lee's, even though it was Lee who influenced and shaped Jackie's iconic style, Lee's husband who helped convince voters to support JFK, Lee's former lover who became Jackie's second husband. Insightful, revelatory, and poignant, this biography paints a complicated portrait of two sisters bound together by love, rivalry, and tragedy.