Diana Mosley was a society beauty who fell from grace when she left her husband, brewery heir Bryan Guinness, for Sir Oswald Mosley, an admirer of Mussolini and a notorious womanizer. This horrified her family and scandalized society.

In 1933, Diana met the new German leader, Adolf Hitler. They became close friends and he attended her wedding as the guest of honor. During the war, the Mosleys' association with Hitler led them to be arrested and interned for three and a half years. Diana's relationships with Hitler and Mosley defined her life in the public eye and marked her as a...