The drama series is about the Crawley family and their servants. Set in the years leading up to World War I, the grand county home Downtown Abbey consists of different family members. Living under the same roof the family deals with these differences in different ways.
Season four covers the period from 1922 to 1923, as the lives of the aristocratic Crawley family and their domestic servants continue. As Lady Mary mourns Matthew's death, Gregson travels to Germany to seek citizenship there, and Edith secretly gives birth to a daughter.