"Exactly."
"But was murdered?"
"He was."
"You went on to say that if I were here this afternoon you would point out to me the murderer."
"I will."
"Point him out."
"I am."
"I thought so."
"I knew you did. I saw on your intelligent visage that you knew what was coming. You have some experience of cranks who accuse themselves of crimes of which they are innocent; you take it for granted that I am one of them, which shows what a dunce you are. I am a lunatic. That's right, Harlow, smile again. I knew that would tickle you. A policeman's sense of humour is his own."
"It is necessary, Mr. Parker, that I should warn you that anything you say will be taken down and used against you."