The mini-series "Belgravia" is a British-American historical drama about the fate of James Trenchard, a wealthy army quartermaster. He buys a house in the most prestigious area of London and tries to enter local high society, pursuing his secret goals. Many years ago, his only daughter died during childbirth, giving birth to an illegitimate child from the heir of the aristocratic Bellasis family. The influential relatives gave the baby to an adoptive family to avoid scandal.