The Shooting Party (1984)

Autumn, 1913: on the eve of the Great War, a small party of lords and ladies gather at the Hertfordshire estate of Sir Randolph Nettleby. A code of propriety governs all: dress, breakfast, relations with the estate's peasants, courtship, shooting, adultery. Lionel Stephens, who is courting Sir Randolph's daughter, gets into a shooting competition with Lord Gilbert Hartlip; Lord Gilbert's wife carries on discreet affairs; a pamphleteer circles the estate calling for no more killing, and Sir Robert's grandson hopes to protect a wild duck he's befriended. A way of life is ending: Lord Gilbert's violation of the gentlemen's code suggests internal rot as the real world presses in.