"One sip was enough!" said Bridget. "I'm all right. Did I do it well, M. Poirot? Goodness, my arm hurts still after that tourniquet you made me put on it."

"You were splendid, my child," said Poirot. "Splendid. But see, all the others are still in the fog. Last night I went to Mademoiselle Bridget. I told her that I knew about your little complot and I asked her if she would act a part for me. She did it very cleverly. She made the footprints with a pair of Mr Lee-Wortley's shoes."

Sarah said in a harsh voice:

"But what's the point of it all, M. Poirot? What's the point of sending Desmond off to fetch the police? They'll be very angry when they find out it's nothing but a hoax."

Poirot shook his head gently.

"But I do not think for one moment, Mademoiselle, that Mr Lee- Wortley went to fetch the police," he said. "Murder is a thing in which Mr Lee-Wortley does not want to be mixed up. He lost his nerve badly. All he could see was his chance to get the ruby. He snatched that, he pretended the telephone was out of order and he rushed off in a car on the pretence of fetching the police. I think myself it is the last you will see of him for some time. He has, I understand, his own ways of getting out of England. He has his own plane, has he not, Mademoiselle?"

Sarah nodded. "Yes," she said. "We were thinking of..." she stopped.

"He wanted you to elope with him that way, did he not? Eh bien, that is a very good way of smuggling a jewel out of the country. When you are eloping with a girl, and that fact is publicised, then you will not be suspected of also smuggling a historic jewel out of the country. Oh yes, that would have made a very good camouflage."

"I don't believe it," said Sarah. "I don't believe a word of it!"

"Then ask his sister," said Poirot, gently nodding his head over her shoulder. Sarah turned her head sharply.

A platinum blonde stood in the doorway. She wore a fur coat and was scowling. She was clearly in a furious temper.

"Sister my foot!" she said, with a short unpleasant laugh. "That swine's no brother of mine! So he's beaten it, has he, and left me to carry the can? The whole thing was his idea! He put me up to it!

Said it was money for jam. They'd never prosecute because of the scandal. I could always threaten to say that Ali had given me his historic jewel. Des and I were to have shared the swag in Paris and now the swine runs out on me! I'd like to murder him!" She switched abruptly. "The sooner I get out of here... Can someone telephone for a taxi?"

"A car is waiting at the front door to take you to the station, Mademoiselle," said Poirot.

"Think of everything, don't you?"

"Most things," said Poirot complacently.

But Poirot was not to get off so easily. When he returned to the dining-room after assisting the spurious Miss Lee-Wortley into the waiting car, Colin was waiting for him.

There was a frown on his boyish face.

"But look here, M. Poirot. What about the ruby? Do you mean to say you've let him get away with it?"

Poirot's face fell. He twirled his moustaches. He seemed ill at ease.

"I shall recover it yet," he said weakly. "There are other ways. I shall still..."

"Well, I do think!" said Michael. "To let that swine get away with the ruby!"

Bridget was sharper.

"He's having us on again," she cried. "You are, aren't you, M. Poirot?"

"Shall we do a final conjuring trick, Mademoiselle? Feel in my left- hand pocket."

Bridget thrust her hand in. She drew it out again with a scream of triumph and held aloft a large ruby blinking in crimson splendour.

"You comprehend," explained Poirot, "the one that was clasped in your hand was a paste replica. I brought it from London in case it was possible to make a substitution. You understand? We do not want the scandal. Monsieur Desmond will try and dispose of that ruby in Paris or in Belgium or wherever it is that he has his contacts, and then it will be discovered that the stone is not real!

What could be more excellent? All finishes happily. The scandal is avoided, my princeling receives his ruby back again, he returns to his country and makes a sober and we hope a happy marriage. All ends well."

"Except for me," murmured Sarah under her breath.

She spoke so low that no one heard her but Poirot. He shook his head gently.

"You are in error, Mademoiselle Sarah, in what you say there. You have gained experience. All experience is valuable. Ahead of you I prophesy there lies happiness."

"That's what you say," said Sarah.

"But look here, M. Poirot," Colin was frowning. "How did you know about the show we were going to put on for you?"

"It is my business to know things," said Hercule Poirot. He twirled his moustache.

"Yes, but I don't see how you could have managed it. Did someone split - did someone come and tell you?"

"No, no, not that."

"Then how? Tell us how?"

They all chorused, "Yes, tell us how."

"But no," Poirot protested. "But no. If I tell you how I deduced that, you will think nothing of it. It is like the conjuror who shows how his tricks are done!"

"Tell us, M. Poirot! Go on. Tell us, tell us!"

"You really wish that I should solve for you this last mystery?"

"Yes, go on. Tell us."

"Ah, I do not think I can. You will be so disappointed."

"Now, come on, M. Poirot, tell us. How did you know?"

"Well, you see, I was sitting in the library by the window in a chair after tea the other day and I was reposing myself. I had been asleep and when I awoke you were discussing your plans just outside the window close to me, and the window was open at the top."

"Is that all?" cried Colin, disgusted. "How simple!"

"Is it not?" said Hercule Poirot, smiling. "You see? You are disappointed."

"Oh well," said Michael, "at any rate we know everything now."

"Do we?" murmured Hercule Poirot to himself. "I do not. I, whose business it is to know things."

He walked out into the hall, shaking his head a little. For perhaps the twentieth time he drew from his pocket a rather dirty piece of paper. "DON'T EAT NONE OF THE PLUM PUDDING. ONE AS

WISHES YOU WELL."

Hercule Poirot shook his head reflectively. He who could explain everything could not explain this! Humiliating. Who had written it?

Why had it been written? Until he found that out he would never know a moment's peace. Suddenly he came out of his reverie to be aware of a peculiar gasping noise. He looked sharply down. On the floor, busy with a dustpan and brush was a tow-headed creature in a flowered overall. She was staring at the paper in his hand with large round eyes.

"Oh sir," said this apparition. "Oh, sir. Please, sir."

"And who may you be, mon enfant?" inquired M. Poirot genially.

"Annie Bates, sir, please sir. I come here to help Mrs Ross. I didn't mean, sir, I didn't mean to to do anything what I shouldn't do. I did mean it well, sir. For your good, I mean."

Enlightenment came to Poirot. He held out the dirty piece of paper.

"Did you write that, Annie?"

"I didn't mean any harm, sir. Really I didn't."

"Of course you didn't, Annie." He smiled at her. "But tell me about it. Why did you write this?"

"Well, it was them two, sir. Mr Lee-Wortley and his sister. Not that she was his sister, I'm sure. None of us thought so! And she wasn't ill a bit. We could all tell that. We thought - we all thought - something queer was going on. I'll tell you straight, sir. I was in her bathroom taking in the clean towels, and I listened at the door. He was in her room and they were talking together. I heard what they said plain as plain. 'This detecive,' he was saying. 'This fellow Poirot who's coming here. We've got to do something about it. We've got to get him out of the way as soon as possible.' And then he says to her in a nasty, sinister sort of way, lowering his voice, 'Where did you put it?' And she answered him 'In the pudding.' Oh, sir, my heart gave such a leap I thought it would stop beating. I thought they meant to poison you in the Christmas pudding. I didn't know what to do!' Mrs Ross, she wouldn't listen to the likes of me. Then the idea came to me as I'd write you a warning. And I did and I put it on your pillow where you'd find it when you went to bed." Annie paused breathlessly.

Poirot surveyed her gravely for some minutes.

"You see too many sensational films, I think, Annie," he said at last,

"or perhaps it is the television that affects you? But the important thing is that you have the good heart and a certain amount of ingenuity. When I return to London I will send you a present."

"Oh thank you, sir. Thank you very much, sir."

"What would you like, Annie, as a present?"

"Anything I like, sir? Could I have anything I like?"

"Within reason," said Hercule Poirot prudently, "yes."

"Oh sir, could I have a vanity box? A real posh slap up vanity box like the one Mr Lee-Wortley's sister, wot wasn't his sister, had?"

"Yes," said Poirot, "yes, I think that could be managed."

"It is interesting," he mused. "I was in a museum the other day observing some antiquities from Babylon or one of those places, thousands of years old and among them were cosmetics boxes. The heart of women does not change."

"Beg your pardon, sir?" said Annie.

"It is nothing," said Poirot, "I reflect. You shall have your vanity box, child."

"Oh thank you, sir. Oh thank you very much indeed, sir."

Annie departed ecstatically. Poirot looked after her, nodding his head in satisfaction.

"Ah," he said to himself. "And now - I go. There is nothing more to be done here."

A pair of arms slipped round his shoulders unexpectedly.

"If you will stand just under the mistletoe..." said Bridget.

Hercule Poirot enjoyed it. He enjoyed it very much. He said to himself that he had had a very good Christmas.