Portrayed by Claire Foy, Lady Persephone "Persie" Towyn is the younger sister of Lady Agnes. A fascist, she has an affair with Harry Spargo, but later leaves him and her family to go to Germany with Joachim von Ribbentrop as his mistress. She is absent from Eaton Place between series 1 and 2, maintaining only minimal contact with her family, but returns in December 1938 after the anti-Semitic violence in Germany escalates. She subsequently discovers she is pregnant by one of her German lovers, and has an abortion. She then has an affair with Sir Hallam. Exposed as a spy for the Nazis and left alone, she commits suicide—by throwing herself off the upper balcony onto the entrance hall floor—after accidentally shooting Beryl with Sir Hallam's service pistol.