The Eye of Evil
The Third Lover original title Lil du malin, also known as The Eye of Evil, is a 1962 drama directed by Claude Chabrol. It is one of Chabrols first films to include social criticism on bourgeoisie lifestyles that would become one of his trademarks in later films. It tells the story of a journalist in southern Germany who is befriended by a novelist and his wife and gradually begins to destroy the couples lives.
Source: Wikipedia
