Claude Chabrol directed his early works, the hero Albin Mercier is a French writer living on the outskirts of Germany, he one day met the famous German writer Andreas Hartman and his wife H é l è ne, Hartman and his wife were wealthy and harmonious. To Albin, they seemed to be the most perfect couple in the world. Albin, who was envious of the two, wanted to break into their lives and even replace Andreas. By peeking into their lives and using all kinds of cunning tricks, Albin and Hartman get closer and closer, but when Albin pursues H é l è ne, a huge secret emerges and eventually leads the trio to destruction.