Agathe, the eldest daughter of the musical Von Trapp family, recalls their story in 1930s Austria, and how they escaped Salzburg to pursue a career in the United States. After losing her mother, Agathe took over the raising of her younger siblings, until the young novitiate nun Maria was engaged to be their nanny. When the Nazis began to threaten their homeland, Agathe and Maria convinced her father that their only chance for survival was to escape Salzburg and start a new life in America....