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 woman who possessed a singular lack of empathy for those less blessed at birth.

Anne de Courcy's revealing biography chronicles one of the most intriguing, controversial women of the twentieth century. It is a riveting tell-all memoir of a leading society hostess, a woman with intimate access to the highest literary, political, and social circles of her time. Written with Mosley's exclusive cooperation and based upon hundreds of hours of taped interviews and unprecedented access to her private papers, letters, and diaries, Lady Mosley's only stipulation was that the book not be published until after her death.