"It is, sir."
"You were present. You know who made those insulting remarks."
"I do not."
"I will know, madam."
"I hope you will be able to learn, for the occurrence will do me great injury unless the mystery is explained."
"There is no mystery about it. You have an impudent rascal in your house. Who is your new boarder?"
"He came to me highly recommended."
"It's all very strange, madam."
"Can it be possible," asked the landlady, "that the new boarder is a detective?"