The events of the past seem so obvious, so easily predictable when reviewed from the vantage point of the present. To take from the past all the lessons it has to offer, however, means forgetting for a moment its eventual outcome. Retrospective histories do not permit this. One book that avoids this paradox is The Mitfords, Letters Between Six Sisters. This collection of correspondence of the six lively and intelligent Mitford sisters begins in 1925 and does not conclude until the first decade of the 21st Century. All six were gifted writers with distinct points of view. Moreover, they were on intimate terms with Churchill, Kennedy, and a great many others who gave form to the 20th Century. Their letters reveal history as it occurs, in real time, and offer extraordinary perspective on how we might better live our lives today.