mention that inquiries at the Agency in London bore out Poirot's prognostication. No such woman as "Mrs. Middleton" had ever been on their books. They had received the Hon. Mrs. Havering's application for a housekeeper, and had sent her various applicants for the post. When she sent them the engagement fee, she omitted to mention which woman she had selected.
Somewhat crestfallen, I returned to London. I found Poirot established in an arm-chair by the fire in a garish, silk dressing-gown. He greeted me with much affection.
"Mon ami Hastings! But how glad I am to see you. Veritably I have for you a great affection! And you have enjoyed yourself? You have run to and fro with the good Japp? You have interrogated and investigated to your heart's content?"
"Poirot," I cried, "the thing's a dark mystery! It will never be solved."
"It is true that we are not likely to cover ourselves with glory over it."
"No, indeed. It's a hard nut to crack."
"Oh, as far as that goes, I am very good at cracking the nuts! A veritable squirrel! It is not that which embarrasses me. I know well
