M. Hercule Poirot was a little late in entering the luncheon-car on the following day. He had risen early, breakfasted almost alone, and had spent the morning going over the notes of the case that was recalling him to London. He had seen little of his travelling companion.

It was not till they were eating a delicate cream cheese that M. Bouc allowed his attention to wander to matters other than nourishment. He was at the stage of a meal when one becomes philosophic.

M. Bouc, who was already seated, gesticulated a greeting and summoned his friend to the empty place opposite him. Poirot sat down and soon found himself in the favoured position of the table which was served first and with the choicest morsels. The food, too, was unusually good.

"It is an idea, that," said Poirot.

"Ah!" he sighed. "If I had but the pen of a Balzac! I would depict this scene." He waved his hand.

"Ah, you agree? It has not been done, I think? And yet -- it lends itself to romance, my friend. All around us are people, of all classes, of all nationalities, of all ages. For three days these people, these strangers to one another, are brought together. They sleep and eat under one roof, they cannot get away from each other. At the end of three days they part, they go their several ways, never, perhaps, to see each other again."

"Some more wine," said M. Bouc, hastily pouring it out. "You are morbid, mon cher. It is, perhaps, the digestion."

"And yet," said Poirot, "suppose an accident --"

"Ah no, my friend --"

"It is true," agreed Poirot, "that the food in Syria was not, perhaps, quite suited to my stomach."

"From your point of view it would be regrettable, I agree. But nevertheless let us just for one moment suppose it. Then, perhaps, all these here are linked together -- by death."

At the table opposite them were three men. They were, he guessed, single travellers graded and placed there by the unerring judgment of the restaurant attendants. A big, swarthy Italian was picking his teeth with gusto. Opposite him a spare, neat Englishman had the expressionless disapproving face of the well-trained servant. Next to the Englishman was a big American in a loud suit -- possibly a commercial traveller.

He sipped his wine. Then, leaning back, he ran his eye thoughtfully round the dining car. There were thirteen people seated there and, as M. Bouc had said, of all classes and nationalities. He began to study them.

The Italian removed his toothpick to gesticulate with it freely.

"You've got to put it over big," he was saying in a loud nasal voice.

The Englishman looked out of the window and coughed.

Poirot's eye passed on.

"Sure," he said. "That whatta I say alla de time."

At a small table, sitting very upright, was one of the ugliest old ladies he had ever seen. It was an ugliness of distinction -- it fascinated rather than repelled. She sat very upright. Round her neck was a collar of very large pearls which, improbable though it seemed, were real. Her hands were covered with rings. Her sable coat was pushed back on her shoulders. A very small expensive black toque was hideously unbecoming to the yellow, toad-like face beneath it.

She was speaking now to the restaurant attendant in a clear, courteous but completely autocratic tone.

"You will be sufficiently amiable to place in my compartment a bottle of mineral water and a large glass of orange juice. You will arrange that I shall have chicken cooked without sauces for dinner this evening -- also some boiled fish."

The attendant replied respectfully that it should be done.

She gave a slight gracious nod of the head and rose. Her glance caught Poirot's and swept over him with the nonchalance of the uninterested aristocrat.

"That is Princess Dragomiroff," said M. Bouc in a low tone. "She is a Russian. Her husband realized all this money before the Revolution and invested it abroad. She is extremely rich. A cosmopolitan."

Poirot agreed.

Poirot nodded. He had heard of Princess Dragomiroff.

"She is a personality," said M. Bouc. "Ugly as sin, but she makes herself felt. You agree?"

At another of the large tables Mary Debenham was sitting with two other women. One of them was a tall middle-aged woman in a plaid blouse and tweed skirt. She had a mass of faded yellow hair unbecomingly arranged in a large bun, wore glasses, and had a long, mild, amiable face rather like a sheep. She was listening to the third woman, a stout, pleasant-faced, elderly woman who was talking in a slow clear monotone which showed no signs of pausing for breath or coming to a stop.

Perhaps, Poirot thought, Mary Debenham had demurred. A governess learns to be careful. Appearances are important. A girl with her living to get has to be discreet.

The train plunged into a tunnel. The calm monotonous voice was drowned.

"… And so my daughter said, 'Why,' she said 'you just can't apply Amurrican methods in this country. It's just natural to the folks here to be indolent,' she said. 'They just haven't got any hustle in them.' But all the same you'd be surprised to know what our college there is doing. They've gotten a fine staff of teachers. I guess there's nothing like education. We've got to apply our Western ideals and teach the East to recognize them. My daughter says --"

At the next table, a small one, sat Colonel Arbuthnot -- alone. His gaze was fixed upon the back of Mary Debenham's head. They were not sitting together. Yet it could easily have been managed. Why?

His glance shifted to the other side of the carriage. At the far end, against the wall, was a middle-aged woman dressed in black with a broad expressionless face. German or Scandinavian, he thought. Probably a German lady's maid.

The woman opposite him was a mere girl -- twenty at a guess. A tight-fitting little black coat and skirt, white satin blouse, small chic black toque perched at the fashionable outrageous angle. She had a beautiful foreign-looking face, dead white skin, large brown eyes, jet-black hair. She was smoking a cigarette in a long holder. Her manicured hands had deep red nails. She wore one large emerald set in platinum. There was coquetry in her glance and voice.

There were only two more lunchers -- Poirot's fellow traveller MacQueen and his employer Mr. Ratchett. The latter sat facing Poirot, and for the second time Poirot studied that unprepossessing face, noting the false benevolence of the brow and the small, cruel eyes.

"Elle est jolie -- et chic," murmured Poirot. "Husband and wife -- eh?"

M. Bouc nodded.

"Hungarian Embassy, I believe," he said. "A handsome couple."

After her came a couple leaning forward and talking animatedly together. The man wore English clothes of loose tweed -- but he was not English. Though only the back of his head was visible to Poirot, the shape of it and the set of the shoulders betrayed him. A big man, well made. He turned his head suddenly and Poirot saw his profile. A very handsome man of thirty odd with a big fair moustache.

"It is at your wild animal you look?" he asked.

Poirot nodded.

Doubtless M. Bouc saw a change in his friend's expression.

"My daughter said, 'Take a book of food tickets and you'll have no trouble -- no trouble at all.' Now, that isn't so. Seems they have to have a ten per cent tip, and then there's that bottle of mineral water -- and a queer sort of water too. They hadn't got any Evian or Vichy, which seems queer to me."

"I return to my compartment," he said. "Come along presently and converse with me."

"With pleasure."

Poirot sipped his coffee and ordered a liqueur. The attendant was passing from table to table with his box of money, accepting payment for bills. The elderly American lady's voice rose shrill and plaintive.

"It is -- they must -- how you say -- serve the water of the country," explained the sheep-faced lady.

As his coffee was brought to him, M. Bouc rose to his feet. Having started before Poirot, he had finished some time ago.

"Well, it seems queer to me." She looked distastefully at the heap of small change on the table in front of her. "Look at all this peculiar stuff he's given me. Dinars or something. Just a lot of rubbish, it looks. My daughter said --"

"I think," he went on, "that I have the pleasure of speaking to M. Hercule Poirot. Is that so?"

Ratchett spoke to his companion, who got up and left the car. Then he rose himself, but instead of following MacQueen he dropped unexpectedly into the seat opposite Poirot.

Mary Debenham pushed back her chair and left with a slight bow to the other two. Colonel Arbuthnot got up and followed her. Gathering up her despised money, the American lady followed suit, followed by the lady like a sheep. The Hungarians had already departed. The restaurant car was empty save for Poirot and Ratchett and MacQueen.

"Can you oblige me with a light?" he said. His voice was soft -- faintly nasal. "My name is Ratchett."

Poirot bowed slightly. He slipped his hand into his pocket and produced a matchbox which he handed to the other man, who took it but did not strike a light.

Poirot bowed again. "You have been correctly informed, Monsieur."

The detective was conscious of those strange shrewd eyes summing him up before the other spoke again.

"Monsieur, in my experience when a man is in a position to have, as you say, enemies, then it does not usually resolve itself into one enemy only."

"My life has been threatened, Mr. Poirot. Now, I'm a man who can take pretty good care of himself." From the pocket of his coat his hand brought a small automatic into sight for a moment. He continued grimly. "I don't think I'm the kind of man to be caught napping. But as I look at it I might as well make assurance doubly sure. I fancy you're the man for my money, Mr. Poirot. And remember -- big money."

"My clientèle, Monsieur, is limited nowadays. I undertake very few cases."

Hercule Poirot was silent a minute or two, then he said: "What is it you wish me to do for you, M.-- er -- Ratchett?"

"Only one enemy?"

"Safety?"

"Why, naturally, I understand that. But this, Mr. Poirot, means big money." He repeated again in his soft, persuasive voice, "Big money."

Hercule Poirot's eyebrows went up a trifle.

"Mr. Poirot, I am a rich man -- a very rich man. Men in that position have enemies. I have an enemy."

"Just what do you mean by that question?" asked Ratchett sharply.

Ratchett seemed relieved by Poirot's answer. He said quickly: "Why, yes, I appreciate that point. Enemy or enemies -- it doesn't matter. What does matter is my safety."

"In my country," he said, "we come to the point quickly. Mr. Poirot, I want you to take on a job for me."

"It will not."

"What's wrong with my proposition?"

Poirot shook his head.

"I also -- M. Ratchett."

"You've got a pretty good nerve," said Ratchett. "Will twenty thousand dollars tempt you?"

The other looked at him shrewdly.

"If you're holding out for more, you won't get it. I know what a thing's worth to me."

"I regret, Monsieur," he said at length. "I cannot oblige you."

"If you will forgive me for being personal -- I do not like your face, M. Ratchett," he said.

"Name your figure, then," he said.

Poirot rose.

And with that he left the restaurant car.

"You do not understand, Monsieur. I have been very fortunate in my profession. I have made enough money to satisfy both my needs and my caprices. I take now only such cases as -- interest me."

Poirot looked at him thoughtfully for some minutes. His face was completely expressionless. The other could have had no clue as to what thoughts were passing in that mind.