The next morning, I stopped at his apartment to look for my glove. While we were talking, we heard people shouting in the street. D'Arcy went to the window and looked out. Quickly, I stepped to the shelf and put the letter in my pocket. Then I replaced it with a letter that looked exactly like it, which I had taken with me. I had made it the night before. The trouble in the street was caused by a man who had almost been run over by a horse and carriage. He was not hurt. And soon the crowd of people went away. When it was over, D'Arcy came away from the window. I said good-bye and left. The man who almost had an accident was one of my servants. I had paid him to create the incident.» Dupin stopped talking to light his pipe. I did not understand. «But, Dupin,» I said, «why did you go to the trouble of replacing the letter? Why not just take it and leave?» Dupin smiled. «D'Arcy is a dangerous man,» he said. «And he has many loyal servants. If I had taken the letter, I might never have left his apartment alive.»