"What! you have an answer already?"
"Yes, aunty."
The old woman took the letter, opened it and read:
"Madam: I saw your advertisement. I will call upon you. When a card is presented with the name of the undersigned you will know it is the detective.
"Yours,
"Oscar Dunne."
"Well, I declare," exclaimed the old lady; "he will call on us."
"But how will he know where to call, aunty; you did not give your address in the advertisement."
"That is so. I had forgotten that. Why, how will he know where to call. I fear I have made a mistake. A man who is as big a dunce as that can be of no service to us."