Cavendon Hall is home to two families, the aristocratic Inghams and the Swanns who serve them, just as their ancestors did over the centuries. Charles Ingham, the sixth Earl of Mowbray, lives there with his wife Felicity and their six children: Guy, the heir, who is studying at Cambridge; their younger son Miles, attending Eton; and their four daughters Diedre, Daphne, DeLacy and Dulcie, affectionately called the Four Dees by the staff. Walter Swann, the premier male of the Swann family, is valet to the earl. His wife Alice, a clever seamstress, who is in charge of the countess's wardrobe, also makes clothes for the four daughters. For centuries, these two families have lived side-by-side, beneath the backdrop of the imposing Yorkshire manor. But now, with World War I looming, these two families will find themselves tested in ways they never thought possible. Loyalties are tested and betrayals are set into motion. In this time of uncertainty, one thing is sure: these two families will never be the same again.