"But now a fresh dilemma arises: he dare not keep that piece of paper on him. He may be seen leaving the room-he may be searched. If the paper is found on him, it is certain doom. Probably, at this minute, too, he hears the sounds below of Mr. Wells and John leaving the boudoir. He must act quickly. Where can he hide this terrible slip of paper? The contents of the waste-paper-basket are kept and in any case, are sure to be examined. There are no means of destroying it; and he dare not keep it. He looks round, and he sees-what do you think, mon ami?"

I shook my head.

"In a moment, he has torn the letter into long thin strips, and rolling them up into spills he thrusts them hurriedly in amongst the other spills in the vase on the mantle-piece."

I uttered an exclamation.

"No one would think of looking there," Poirot continued. "And he will be able, at his leisure, to come back and destroy this solitary piece of evidence against him."

"Then, all the time, it was in the spill vase in Mrs. Inglethorp's bedroom, under our very noses?" I cried.

Poirot nodded.

"Yes, my friend. That is where I discovered my 'last link,' and I owe that very fortunate discovery to you."

"To me?"

"Yes. Do you remember telling me that my hand shook as I was straightening the ornaments on the mantel-piece?"

"Yes, but I don't see--"

"No, but I saw. Do you know, my friend, I remembered that earlier in the morning, when we had been there together, I had straightened all the objects on the mantel-piece. And, if they were already straightened, there would be no need to straighten them again, unless, in the meantime, some one else had touched them."

"Dear me," I murmured, "so that is the explanation of your extraordinary behaviour. You rushed down to Styles, and found it still there?"

"Yes, and it was a race for time."

"But I still can't understand why Inglethorp was such a fool as to leave it there when he had plenty of opportunity to destroy it."

"Ah, but he had no opportunity. I saw to that."

"You?"

"Yes. Do you remember reproving me for taking the household into my confidence on the subject?"

"Yes."

"Well, my friend, I saw there was just one chance. I was not sure then if Inglethorp was the criminal or not, but if he was I reasoned that he would not have the paper on him, but would have hidden it somewhere, and by enlisting the sympathy of the household I could effectually prevent his destroying it. He was already under suspicion, and by making 190» the matter public I secured the services of about ten amateur detectives, who would be watching him unceasingly, and being himself aware of their watchfulness he would not dare seek further to destroy the document. He was therefore forced to depart from the house, leaving it in the spill vase."

"But surely Miss Howard had ample opportunities of aiding him."

"Yes, but Miss Howard did not know of the paper's existence. In accordance with their prearranged plan, she never spoke to Alfred Inglethorp. They were supposed to be deadly enemies, and until John Cavendish was safely convicted they neither of them dared risk a meeting. Of course I had a watch kept on Mr. Inglethorp, hoping that sooner or later he would lead me to the hiding-place. But he was too clever to take any chances. The paper was safe where it was; since no one had thought of looking there in the first week, it was not likely they would do so afterwards. But for your lucky remark, we might never have been able to bring him to justice."

"I understand that now; but when did you first begin to suspect Miss Howard?"

"When I discovered that she had told a lie at the inquest about the letter she had received from Mrs. Inglethorp."

"Why, what was there to lie about?"

"You saw that letter? Do you recall its general appearance?"

"Yes-more or less."

"You will recollect, then, that Mrs. Inglethorp wrote a very distinctive hand, and left large clear spaces between her words. But if you look at the date at the top of the letter you will notice that 'July 17th' is quite different in this respect. Do you see what I mean?"

"No," I confessed, "I don't."

"You do not see that that letter was not written on the 17th, but on the 7th-the day after Miss Howard's departure? The '1' was written in before the '7' to turn it into the '17th'."

"But why?"

"That is exactly what I asked myself. Why does Miss Howard suppress the letter written on the 17th, and produce this faked one instead? Because she did not wish to show the letter of the 17th. Why, again? And at once a suspicion dawned in my mind. You will remember my saying that it was wise to beware of people who were not telling you the truth."

"And yet," I cried indignantly, "after that, you gave me two reasons why Miss Howard could not have committed the crime!"

"And very good reasons too," replied Poirot. "For a long time they were a stumbling-block to me until I remembered a very significant fact: that she and Alfred Inglethorp were cousins. She could not have committed the crime single-handed, but the reasons against that did not debar her from being an accomplice. And, then, there was that rather over-vehement hatred of hers! It concealed a very opposite emotion. There was, undoubtedly, a tie of passion between them long before he came to Styles. They had already arranged their infamous plot-that he should marry this rich, but rather foolish old lady, induce her to make a will leaving her money to him, and then gain their ends by a very cleverly conceived crime. If all had gone as they planned, they would probably have left England, and lived together on their poor victim's money.

"They are a very astute and unscrupulous pair. While suspicion was to be directed against him, she would be making quiet preparations for a very different denouement. She arrives from Middlingham with all the compromising items in her possession. No suspicion attaches to her. No notice is paid to her coming and going in the house. She hides the strychnine and glasses in John's room. She puts the beard in the attic. She will see to it that sooner or later they are duly discovered."

"I don't quite see why they tried to fix the blame on John," I remarked. "It would have been much easier for them to bring the crime home to Lawrence."

"Yes, but that was mere chance. All the evidence against him arose out of pure accident. It must, in fact, have been distinctly annoying to the pair of schemers."

"His manner was unfortunate," I observed thoughtfully.

"Yes. You realize, of course, what was at the back of that?"

"No."

"You did not understand that he believed Mademoiselle Cynthia guilty of the crime?"

"No," I exclaimed, astonished. "Impossible!"

"Not at all. I myself nearly had the same idea. It was in my mind when I asked Mr. Wells that first question about the will. Then there were the bromide powders which she had made up, and her clever male impersonations, as Dorcas recounted them to us. There was really more evidence against her than anyone else."

"You are joking, Poirot!"

"No. Shall I tell you what made Monsieur Lawrence turn so pale when he first entered his mother's room on the fatal night? It was because, whilst his mother lay there, obviously poisoned, he saw, over your shoulder, that the door into Mademoiselle Cynthia's room was unbolted."

"But he declared that he saw it bolted!" I cried.

"Exactly," said Poirot dryly. "And that was just what confirmed my suspicion that it was not. He was shielding Mademoiselle Cynthia."

"But why should he shield her?"

"Because he is in love with her."

I laughed.

"There, Poirot, you are quite wrong! I happen to know for a fact that, far from being in love with her, he positively dislikes her."

"Who told you that, mon ami?"

"Cynthia herself."

"La pauvre petite! And she was concerned?"

"She said that she did not mind at all."

"Then she certainly did mind very much," remarked Poirot. "They are like that-les femmes!"

"What you say about Lawrence is a great surprise to me," I said.

"But why? It was most obvious. Did not Monsieur Lawrence make the sour face every time Mademoiselle Cynthia spoke and laughed with his brother? He had taken it into his long head that Mademoiselle Cynthia was in love with Monsieur John. When he entered his mother's room, and saw her obviously poisoned, he jumped to the conclusion that Mademoiselle Cynthia knew something about the matter. He was nearly driven desperate. First he crushed the coffee-cup to powder under his feet, remembering that *SHE had gone up with his mother the night before, and he determined that there should be no chance of testing its contents. Thenceforward, he strenuously, and quite uselessly, upheld the theory of 'Death from natural causes'."

"And what about the 'extra coffee-cup'?"

"I was fairly certain that it was Mrs. Cavendish who had hidden it, but I had to make sure. Monsieur Lawrence did not know at all what I meant; but, on reflection, he came to the conclusion that if he could find an extra coffee-cup anywhere his lady love would be cleared of suspicion. And he was perfectly right."

"One thing more. What did Mrs. Inglethorp mean by her dying words?"

"They were, of course, an accusation against her husband."

"Dear me, Poirot," I said with a sigh, "I think you have explained everything. I am glad it has all ended so happily. Even John and his wife are reconciled."

"Thanks to me."

"How do you mean-thanks to you?"

"My dear friend, do you not realize that it was simply and solely the trial which has brought them together again? That John Cavendish still loved his wife, I was convinced. Also, that she was equally in love with him. But they had drifted very far apart. It all arose from a misunderstanding. She married him without love. He knew it. He is a sensitive man in his way, he would not force himself upon her if she did not want him. And, as he withdrew, her love awoke. But they are both unusually proud, and their pride held them inexorably apart. He drifted into an entanglement with Mrs. Raikes, and she deliberately cultivated the friendship of Dr. Bauerstein. Do you remember the day of John Cavendish's arrest, when you found me deliberating over a big decision?"