The episode spans from August to November 1955 and follows these key narrative threads:
Princess Margaret and Peter Townsend are finally reunited after two years apart. However, Prime Minister Anthony Eden informs Elizabeth that if Margaret marries the divorced Townsend, she must give up her title, income, and rights of succession, and live abroad for several years. The Crown subtitles English S01E10
Pressured by the Cabinet and the Church, Elizabeth eventually tells Margaret she cannot support the union. Margaret chooses to issue a public statement ending her relationship with Townsend to remain part of the royal family. The episode spans from August to November 1955