This final episode focuses on Victoria's relationship with her sons and how, after Albert's death, they struggled to live up to his model of purity. It explores Victoria's difficult relationship with her eldest son Bertie, whom she blamed for Albert's death, believing his sexual indiscretions to have fatally weakened her husband. It also examines her relationship with her son Leopold, the physically weak but spirited haemophiliac who put up the most determined effort to break free from his mother's control. Ultimately, the idea of monarchy based on purity is put to the test as the philandering Bertie comes to the throne.