As preparations are made for one of the younger Mitford girls to become a debutante, the family is struggling with the aftermath of the Great Depression and have to cut corners.

Diane is seduced from her boring life as a millionaire's wife by the suave Oswald Mosley and risks everything on her relationship with him.

Unity persuades her parents to let her attend a school in Munich and becomes obsessed with meeting Hitler. Diana is annoyed when Nancy writes a book that ridicules Mosley's fascist movement.

Unity and Diane are furious about the release of Nancy's new book ridiculing the fascists, but Unity is thrilled with her increasing connections with Hitler.

Diana goes to recuperate in Italy where she tries to persuade Mosley to marry her but he continues to say that it will cause too much scandal and damage his political career.