S04E09 The London Season
1923. A year has passed and Edith returned from Switzerland having secretly had her baby and given her up for adoption. The family and staff journey to London for debutante Lady Rose to be presented to the king. Martha Levinson and her son Harold also turn up and Mary meets both Anthony and Charles, who openly vie for her attention. Rose goes to a club with married friend Freda Dudley-Ward, from whom the cardsharp Sampson steals a love letter from the Prince of Wales. Mary and Charles endeavour to retrieve it in vain, though the escapade brings them closer. John is called upon to help obtain it. Mary is annoyed to learn from Anthony that the supposedly-republican Charles is himself an aristocrat's heir. Mrs Hughes and Mary discover that John was indeed in London on the day of Green's death. Martha attracts gold-digging admirer Lord Aysgarth but sees through him and turns down his proposal, though Harold, to his surprise, charms Aysgarth's daughter Madeleine and the Levinson valet ...