Diana, Lady Mosley, known as Diana Guinness between 1929 and 1936, was a British fascist, aristocrat, writer, and editor. She was one of the Mitford sisters and the wife of Oswald Mosley, leader of the British Union of Fascists. From Wikipedia
Drawing on personal letters—alongside Bessie Carter’s authentic connection to Nancy—this drama examines radical allegiances that tore a privileged family apart.