Miss Russell departed. Poirot and I were left together.
“So that’s that,” I said. “Every time we come back to Ralph Paton. How did you manage to spot Miss Russell as the person Charles Kent came to meet? Did you notice the resemblance?”
“I had connected her with the unknown man long before we actually came face to face with him. As soon as we found that quill. The quill suggested dope, and I remembered your account of Miss Russell’s visit to you. Then I found the article on cocaine in that morning’s paper. It all seemed very clear. She had heard from some one that morning—some one addicted to drugs, she read the article in the paper, and she came to you to ask a few tentative questions. She mentioned cocaine, since the article in question was on cocaine. Then, when you seemed too interested, she switched hurriedly to the subject of detective stories and untraceable poisons. I suspected a son or a brother, or some other undesirable male relation. Ah! but I must go. It is the time of the lunch.”
“Stay and lunch with us,” I suggested.
Poirot shook his head. A faint twinkle came into his eye.
“Not again to-day. I should not like to force Mademoiselle Caroline to adopt a vegetarian diet two days in succession.”
It occurred to me that there was not much which escaped Hercule Poirot.
CHAPTER XXI
THE PARAGRAPH IN THE PAPER
Caroline, of course, had not failed to see Miss Russell come to the surgery door. I had anticipated this, and had ready an elaborate account of the lady’s bad knee. But Caroline was not in a cross-questioning mood. Her point of view was that she knew what Miss Russell had really come for and that I didn’t.