"But after that things began to go wrong; someone must have seen me stealing out of the house and have reported the matter to Sir Reuben. He became suspicious and hunted up my references, and soon discovered the fact that they were forged. The crisis came on the day of the murder. I think he thought I was after his wife's jewels. Whatever his suspicions were, he had no intention of allowing me to remain any longer at Mon Repos, though he agreed not to prosecute me on account of the references. Lady Astwell took my part throughout and stood up valiantly to Sir Reuben."

She paused. Poirot's face was very grave.

"And now, Mademoiselle," he said, "we come to the night of the murder."

Lily swallowed hard and nodded her head.

"To begin with, M. Poirot, I must tell you that my brother had come down again, and that I had arranged to creep out and meet him once more. I went up to my room, as I have said, but I did not go to bed. Instead, I waited till I thought everyone was asleep, and then stole downstairs again and out by the side door. I met Humphrey and acquainted him in a few hurried words with what had occurred. I told him that I believed the papers he wanted were in Sir Reuben's safe in the Tower room, and we agreed as a last desperate adventure to try and get hold of them that night.

"I was to go in first and see that the way was clear. I heard the church clock strike twelve as I went in by the side door. I was half-way up the stairs leading to the Tower room, when I heard a thud of something falling, and a voice cried out, 'My G.o.d!' A minute or two afterwards the door of the Tower room opened, and Charles Leverson came out. I could see his face quite clearly in the moonlight, but I was crouching some way below him on the stairs where it was dark, and he did not see me at all.

"He stood there a moment swaying on his feet and looking ghastly. He seemed to be listening; then with an effort he seemed to pull himself together and, opening the door into the Tower room, called out something about there being no harm done. His voice was quite jaunty and debonair, but his face gave the lie to it. He waited a minute more, and then slowly went on upstairs and out of sight.

"When he had gone I waited a minute or two and then crept to the Tower room door. I had a feeling that something tragic had happened. The main light was out, but the desk lamp was on, and by its light I saw Sir Reuben lying on the floor by the desk. I don't know how I managed it, but I nerved myself at last to go over and kneel down by him. I saw at once that he was dead, struck down from behind, and also that he couldn't have been dead long; I touched his hand and it was still quite warm. It was just horrible, M. Poirot. Horrible!"

She shuddered again at the remembrance.

"And then?" said Poirot, looking at her keenly.

Lily Margrave nodded.

"Yes, M. Poirot, I know what you are thinking. Why didn't I give the alarm and raise the house? I should have done so, I know, but it came over me in a flash, as I knelt there, that my quarrel with Sir Reuben, my stealing out to meet Humphrey, the fact that I was being sent away on the morrow, made a fatal sequence. They would say that I had let Humphrey in, and that Humphrey had killed Sir Reuben out of revenge. If I said that I had seen Charles Leverson leaving the room, no one would believe me.

"It was terrible, M. Poirot! I knelt there, and thought and thought, and the more I thought the more my nerve failed me. Presently I noticed Sir Reuben's keys which had dropped from his pocket as he fell. Among them was the key of the safe, the combination word I already knew, since Lady Astwell had mentioned it once in my hearing. I went over to that safe, M. Poirot, unlocked it and rummaged through the papers I found there.

"In the end I found what I was looking for. Humphrey had been perfectly right. Sir Reuben was behind the Mpala Gold Fields, and he had deliberately swindled Humphrey. That made it all the worse. It gave a perfectly definite motive for Humphrey having committed the crime. I put the papers back in the safe, left the key in the door of it, and went straight upstairs to my room. In the morning I pretended to be surprised and horror-stricken, like everyone else, when the housemaid discovered the body."

She stopped and looked piteously across at Poirot.

"You do believe me, M. Poirot. Oh, do say you believe me!"

"I believe you, Mademoiselle," said Poirot; "you have explained many things that puzzled me. Your absolute certainty, for one thing, that Charles Leverson had committed the crime, and at the same time your persistent efforts to keep me from coming down here."

Lily nodded.

"I was afraid of you," she admitted frankly. "Lady Astwell could not know, as I did, that Charles was guilty, and I couldn't say anything. I hoped against hope that you would refuse to take the case."

"But for that obvious anxiety on your part, I might have done so," said Poirot drily.

Lily looked at him swiftly, her lips trembled a little.

"And now, M. Poirot, what-what are you going to do?"

"As far as you are concerned, Mademoiselle, nothing. I believe your story, and I accept it. The next step is to go to London and see Inspector Miller."

"And then?" asked Lily.

"And then," said Poirot, "we shall see."

Outside the door of the study he looked once more at the little square of stained green chiffon which he held in his hand.

"Amazing," he murmured to himself complacently, "the ingenuity of Hercule Poirot."

Detective-Inspector Miller was not particularly fond of M. Hercule Poirot. He did not belong to that small band of inspectors at the Yard who welcomed the little Belgian's cooperation. He was wont to say that Hercule Poirot was much overrated. In this case he felt pretty sure of himself, and greeted Poirot with high good humour in consequence.

"Acting for Lady Astwell, are you? Well, you have taken up a mare's nest in that case."

"There is, then, no possible doubt about the matter?"

Miller winked. "Never was a clearer case, short of catching a murderer absolutely red-handed."

"M. Leverson has made a statement, I understand?"

"He had better have kept his mouth shut," said the detective. "He repeats over and over again that he went straight up to his room and never went near his uncle. That's a fool story on the face of it."

"It is certainly against the weight of evidence," murmured Poirot. "How does he strike you, this young M. Leverson?"

"Darned young fool."

"A weak character, eh?"

The inspector nodded.

"One would hardly think a young man of that type would have the-how do you say it-the bowels to commit such a crime."

"On the face of it, no," agreed the inspector. "But, bless you, I have come across the same thing many times. Get a weak, dissipated young man into a corner, fill him up with a drop too much to drink, and for a limited amount of time you can turn him into a fire-eater. A weak man in a corner is more dangerous than a strong man."

"That is true, yes; that is true what you say."

Miller unbent a little further.

"Of course, it is all right for you, M. Poirot," he said. "You get your fees just the same, and naturally you have to make a pretence of examining the evidence to satisfy her ladyship. I can understand all that."

"You understand such interesting things," murmured Poirot, and took his leave.

His next call was upon the solicitor representing Charles Leverson. Mr. Mayhew was a thin, dry, cautious gentleman. He received Poirot with reserve. Poirot, however, had his own ways of inducing confidence. In ten minutes' time the two were talking together amicably.

"You will understand," said Poirot, "I am acting in this case solely on behalf of Mr. Leverson. That is Lady Astwell's wish. She is convinced that he is not guilty."

"Yes, yes, quite so," said Mr. Mayhew without enthusiasm.

Poirot's eyes twinkled. "You do not perhaps attach much importance to the opinions of Lady Astwell?" he suggested.

"She might be just as sure of his guilt tomorrow," said the lawyer drily.

"Her intuitions are not evidence certainly," agreed Poirot, "and on the face of it the case looks very black against this poor young man."

"It is a pity he said what he did to the police," said the lawyer; "it will be no good his sticking to that story."

"Has he stuck to it with you?" inquired Poirot.

Mayhew nodded. "It never varies an iota. He repeats it like a parrot."

"And that is what destroys your faith in him," mused the other. "Ah, don't deny it," he added quickly, holding up an arresting hand. "I see it only too plainly. In your heart you believe him guilty. But listen now to me, to me, Hercule Poirot. I present to you a case.

"This young man comes home, he has drunk the c.o.c.ktail, the c.o.c.ktail, and again the c.o.c.ktail, also without doubt the English whisky and soda many times. He is full of, what you call it? the courage Dutch, and in that mood he let himself into the house with his latchkey, and he goes with unsteady steps up to the Tower room. He looks in at the door and sees in the dim light his uncle, apparently bending over the desk.

"M. Leverson is full, as we have said, of the courage Dutch. He lets himself go, he tells his uncle just what he thinks of him. He defies him, he insults him, and the more his uncle does not answer back, the more he is encouraged to go on, to repeat himself, to say the same thing over and over again, and each time more loudly. But at last the continued silence of his uncle awakens an apprehension. He goes nearer to him, he lays his hand on his uncle's shoulder, and his uncle's figure crumples under his touch and sinks in a heap to the ground.

"He is sobered then, this M. Leverson. The chair falls with a crash, and he bends over Sir Reuben. He realizes what has happened, he looks at his hand covered with something warm and red. He is in a panic then, he would give anything on earth to recall the cry which has just sprung from his lips, echoing through the house. Mechanically he picks up the chair, then he hastens out through the door and listens. He fancies he hears a sound, and immediately, automatically, he pretends to be speaking to his uncle through the open door.

"The sound is not repeated. He is convinced he has been mistaken in thinking he heard one. Now all is silence, he creeps up to his room, and at once it occurs to him how much better it will be if he pretends never to have been near his uncle that night. So he tells his story. Parsons at that time, remember, has said nothing of what he heard. When he does do so, it is too late for M. Leverson to change. He is stupid, and he is obstinate, he sticks to his story. Tell me, Monsieur, is that not possible?"

"Yes," said the lawyer, "I suppose in the way you put it that it is possible."

Poirot rose to his feet.

"You have the privilege of seeing M. Leverson," he said. "Put to him the story I have told you, and ask him if it is not true."

Outside the lawyer's office, Poirot hailed a taxi.

"Three-four-eight Harley Street," he murmured to the driver.

Poirot's departure for London had taken Lady Astwell by surprise, for the little man had not made any mention of what he proposed doing. On his return, after an absence of twenty-four hours, he was informed by Parsons that Lady Astwell would like to see him as soon as possible. Poirot found the lady in her own boudoir. She was lying down on the divan, her head propped up by cushions, and she looked startlingly ill and haggard; far more so than she had done on the day Poirot arrived.

"So you have come back, M. Poirot?"

"I have returned, Madame."

"You went to London?"

Poirot nodded.

"You didn't tell me you were going," said Lady Astwell sharply.

"A thousand apologies, Madame, I am in error, I should have done so. La prochaine fois-"

"You will do exactly the same," interrupted Lady Astwell with a shrewd touch of humour. "Do things first and tell people afterwards, that is your motto right enough."

"Perhaps it has also been Madame's motto?" His eyes twinkled.

"Now and then, perhaps," admitted the other. "What did you go up to London for, M. Poirot? You can tell me now, I suppose?"

"I had an interview with the good Inspector Miller, and also with the excellent Mr. Mayhew."

Lady Astwell's eyes searched his face.

"And you think, now-?" she said slowly.

Poirot's eyes were fixed on her steadily.

"That there is a possibility of Charles Leverson's innocence," he said gravely.

"Ah!" Lady Astwell half-sprung up, sending two cushions rolling to the ground. "I was right, then, I was right!"

"I said a possibility, Madame, that is all."

Something in his tone seemed to strike her. She raised herself on one elbow and regarded him piercingly.

"Can I do anything?" she asked.

"Yes," he nodded his head, "you can tell me, Lady Astwell, why you suspect Owen Trefusis."

"I have told you I know-that's all."

"Unfortunately, that is not enough," said Poirot drily. "Cast your mind back to the fatal evening, Madame. Remember each detail, each tiny happening. What did you notice or observe about the secretary? I, Hercule Poirot, tell you there must have been something."

Lady Astwell shook her head.

"I hardly noticed him at all that evening," she said, "and I certainly was not thinking of him."

"Your mind was taken up by something else?"

"Yes."

"With your husband's animus against Miss Lily Margrave?"

"That's right," said Lady Astwell, nodding her head; "you seem to know all about it, M. Poirot."

"Me, I know everything," declared the little man with an absurdly grandiose air.

"I am fond of Lily, M. Poirot; you have seen that for yourself. Reuben began kicking up a rumpus about some reference or other of hers. Mind you, I don't say she hadn't cheated about it. She had. But, bless you, I have done many worse things than that in the old days. You have got to be up to all sorts of tricks to get round theatrical managers. There is nothing I wouldn't have written, or said, or done, in my time.

"Lily wanted this job, and she put in a lot of slick work that was not quite-well, quite the thing, you know. Men are so stupid about that sort of thing; Lily really might have been a bank clerk absconding with millions for the fuss he made about it. I was terribly worried all the evening, because, although I could usually get round Reuben in the end, he was terribly pigheaded at times, poor darling. So of course I hadn't time to go noticing secretaries, not that one does notice Mr. Trefusis much, anyway. He is just there and that's all there is to it."

"I have noticed that fact about M. Trefusis," said Poirot. "His is not a personality that stands forth, that shines, that hits you cr-r-rack."

"No," said Lady Astwell, "he is not like Victor."

"M. Victor Astwell is, I should say, explosive."

"That is a splendid word for him," said Lady Astwell. "He explodes all over the house, like one of those thingimyjig firework things."

"A somewhat quick temper, I should imagine?" suggested Poirot.

"Oh, he's a perfect devil when roused," said Lady Astwell, "but bless you, I'm not afraid of him. All bark and no bite to Victor."

Poirot looked at the ceiling.