North & South : Season 1 Episode 3

Deeply hurt at the refusal of his marriage proposal, Thornton and Margaret's relationship becomes more tense and difficult. Just in time, Frederick comes home to visit his dying mother. Thornton mistakes him for Margaret's lover. As Margaret realizes that she might have been mistaken in her harsh and hasty criticism of Thornton, she has to sadly observe his opinion of her altering. Shortly after the death of her mother, Margaret's friend Bessy also dies.