“Don’t you know?”

“Not in the least. Do you?”

I was compelled to shake my head.

“What extra coffee-cup?”

“I don’t know.”

“He’d better ask Dorcas, or one of the maids, if he wants to know about coffee-cups. It’s their business, not mine. I don’t know anything about the coffee-cups, except that we’ve got some that are never used, which are a perfect dream! Old Worcester. You’re not a connoisseur, are you, Hastings?”

I shook my head.

“You miss a lot. A really perfect bit of old china—it’s pure delight to handle it, or even to look at it.”

“Well, what am I to tell Poirot?”

“Tell him I don’t know what he’s talking about. It’s double Dutch to me.”

“All right.”

I was moving off towards the house again when he suddenly called me back.

“I say, what was the end of that message? Say it over again, will you?”

“‘Find the extra coffee-cup, and you can rest in peace.’ Are you sure you don’t know what it means?” I asked him earnestly.

He shook his head.

“No,” he said musingly, “I don’t. I—I wish I did.”

The boom of the gong sounded from the house, and we went in together. Poirot had been asked by John to remain to lunch, and was already seated at the table.

By tacit consent, all mention of the tragedy was barred. We conversed on the war, and other outside topics. But after the cheese and biscuits had been handed round, and Dorcas had left the room, Poirot suddenly leant forward to Mrs. Cavendish.

“Pardon me, madame, for recalling unpleasant memories, but I have a little idea”—Poirot’s “little ideas” were becoming a perfect byword—“and would like to ask one or two questions.”

“Of me? Certainly.”

“You are too amiable, madame. What I want to ask is this: the door leading into Mrs. Inglethorp’s room from that of Mademoiselle Cynthia, it was bolted, you say?”

“Certainly it was bolted,” replied Mary Cavendish, rather surprised. “I said so at the inquest.”

“Bolted?”

“Yes.” She looked perplexed.

“I mean,” explained Poirot, “you are sure it was bolted, and not merely locked?”

“Oh, I see what you mean. No, I don’t know. I said bolted, meaning that it was fastened, and I could not open it, but I believe all the doors were found bolted on the inside.”

“Still, as far as you are concerned, the door might equally well have been locked?”

“Oh, yes.”

“You yourself did not happen to notice, madame, when you entered Mrs. Inglethorp’s room, whether that door was bolted or not?”

“I—I believe it was.”

“But you did not see it?”

“No. I—never looked.”

“But I did,” interrupted Lawrence suddenly. “I happened to notice that it was bolted.”

“Ah, that settles it.” And Poirot looked crestfallen.

I could not help rejoicing that, for once, one of his “little ideas” had come to naught.

After lunch Poirot begged me to accompany him home. I consented rather stiffly.

“You are annoyed, is it not so?” he asked anxiously, as we walked through the park.

“Not at all,” I said coldly.

“That is well. That lifts a great load from my mind.”

This was not quite what I had intended. I had hoped that he would have observed the stiffness of my manner. Still, the fervour of his words went towards the appeasing of my just displeasure. I thawed.

“I gave Lawrence your message,” I said.

“And what did he say? He was entirely puzzled?”

“Yes. I am quite sure he had no idea of what you meant.”

I had expected Poirot to be disappointed; but, to my surprise, he replied that that was as he had thought, and that he was very glad. My pride forbade me to ask any questions.

Poirot switched off on another tack.

“Mademoiselle Cynthia was not at lunch to-day? How was that?”

“She is at the hospital again. She resumed work to-day.”

“Ah, she is an industrious little demoiselle. And pretty too. She is like pictures I have seen in Italy. I would rather like to see that dispensary of hers. Do you think she would show it to me?”

“I am sure she would be delighted. It’s an interesting little place.”

“Does she go there every day?”