In 1964, Kathy McKeon was just nineteen years old and newly arrived from Ireland when she was hired as the personal assistant to former first lady Jackie Kennedy. The next thirteen years of her life were spent in Jackie's service, during which Kathy not only played a crucial role in raising young Caroline and John Jr., but also had a front-row seat to some of the twentieth century's most significant events. Because Kathy was always at Jackie's side,...