Jackie Kennedy Onassis remains to this day an iconic figure of high fashion and tragedy. Her sister Lee Radziwell, however, is less well-known. Yet, it is impossible to understand one without the other, their lives were intertwined - through rivalry and resentment, love and loss. Filmed in New York, Boston, and London, and narrated by Rachael Stirling (Detectorists; Capital), this documentary includes contributions from authors Sarah Bradford ("America's Queen"), Pamela Keogh ("Jackie Style") and Tina Cassidy ("Jackie after O") along with Jackie's one time neighbor Tina Santi Flaherty and Ron Galella, the photographer who followed the two sisters around Manhattan.