The hero of this film is the legendary hero "black tulip"-Count Guillaume (played by alain delon). During the French Revolution, he planned the riot of 1789, which threatened the peace of the nobles and made them panic all the time, robbing the rich to help the poor and saving the people. During the French Revolution, a knight errant who claimed to be black tulip frightened the nobles. In fact, black tulip is an alias for Count Guillaume. Count Guillaume turned into a knight-errant code-named black tulip, robbing noble vehicles, robbing gold, silver and jewels, and calling him a civilian. Mr Ramsey, the police chief, suspected that the Earl was black tulip, set a trap and stabbed him in the left cheek in the melee, leaving a scar. Checkpoints have been set up all over the city to search for people with scars. The count must attend the political meeting on Friday. If he doesn't show up, it means that he is black tulip. The count asked his entourage to bring his twin brother curien (played by Allen Delong) to the meeting instead of himself. Curie was a warm-blooded young man who was completely inclined to civilians. He asked his brother to help the civilians and fight back against the nobles. The count told him that everything he did was for himself. Curie was angry with his brother's behavior, and he decided to stand up instead of his brother and fight with the civilians who had the good name of black tulip. Finally, he was caught by mistake and sentenced to hanging. Guillaume loved his younger brother, and blamed himself for leaving him in a desperate situation. So he went to prison to save his younger brother, and he was injured and arrested. Just as Guillaume was facing the death penalty in the square, Curie reappeared as black tulip, upholding justice. After the victory of the revolution, Curie and his girlfriend Caroline were intoxicated with the sweetness of freedom and love and danced. ...