‘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 to allow 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 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 halfway up the stairs leading to the Tower room, when I heard a thud of something falling, and a voice cried out, “My God!” 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 dryly.
Lily looked at him swiftly, her lips trembled a little.