'Touched with genius' - The SpectatorWhat’s the best way to get the upper hand in an argument solely through letters? How should you liven up a dull night at Buckingham Palace? When, exactly, is the best time to run away to the Spanish Civil War? The Mitford sisters – Nancy, Pamela, Diana, Unity, Jessica and Deborah – knew the answers to all these questions and more.Perhaps the most remarkable family of the mid-twentieth century, their exciting and varied lives, from communist to fascist to aristocrat, mean that there’s no problem they can’t solve.