1Poirot started to keep his dinner appointment with a margin of three-quarters of an hour to spare. He had an object in this. The car took him, not straight to Monte Carlo, but to Lady Tamplin's house at Cap Martin, where he asked for Miss Grey. The ladies were dressing and Poirot was shown into a small salon to wait, and here, after a lapse of three or four minutes, Lenox Tamplin came to him.

2"Katherine is not quite ready yet," she said. "Can I give her a message, or would you rather wait until she comes down?"

3Poirot looked at her thoughtfully. He was a minute or two in replying, as though something of great weight hung upon his decision. Apparently the answer to such a simple question mattered.

4"No," he said at last, "no, I do not think it is necessary that I should wait to see Mademoiselle Katherine. I think, perhaps, that it is better that I should not. These things are sometimes difficult."

5Lenox waited politely, her eyebrows slightly raised.

6"I have a piece of news," continued Poirot. "You will, perhaps, tell your friend. M. Kettering was arrested to-night for the murder of his wife."

7"You want me to tell Katherine that?" asked Lenox. She breathed rather hard, as though she had been running; her face, Poirot thought, looked white and strained—rather noticeably so.

8"If you please, Mademoiselle."

9"Why?" said Lenox. "Do you think Katherine will be upset? Do you think she cares?"

10"I don't know, Mademoiselle," said Poirot. "See, I admit it frankly. As a rule I know everything, but in this case, I—well, I do not. You, perhaps, know better than I do."

11"Yes," said Lenox, "I know—but I am not going to tell you all the same."

12She paused for a minute or two, her dark brows drawn together in a frown.

13"You believe he did it?" she said abruptly.

14Poirot shrugged his shoulders.

15"The police say so."

16"Ah," said Lenox, "hedging, are you? So there is something to hedge about."

17Again she was silent, frowning. Poirot said gently:

18"You have known Derek Kettering a long time, have you not?"

19"Off and on ever since I was a kid," said Lenox gruffly.

20Poirot nodded his head several times without speaking.

21With one of her brusque movements Lenox drew forward a chair and sat down on it, her elbows on the table and her face supported by her hands. Sitting thus, she looked directly across the table at Poirot.

22"What have they got to go on?" she demanded. "Motive, I suppose. Probably came into money at her death."

23"He came into two million."

24"And if she had not died he would have been ruined?"

25"Yes."

26"But there must have been more than that," persisted Lenox. "He travelled by the same train, I know, but—that would not be enough to go on by itself."

27"A cigarette case with the letter 'K' on it which did not belong to Mrs. Kettering was found in her carriage, and he was seen by two people entering and leaving the compartment just before the train got into Lyons."

28"What two people?"

29"Your friend Miss Grey was one of them. The other was Mademoiselle Mirelle, the dancer."

30"And he, Derek, what has he got to say about it?" demanded Lenox sharply.

31"He denies having entered his wife's compartment at all," said Poirot.

32"Fool!" said Lenox crisply, frowning. "Just before Lyons, you say? Does nobody know when—when she died?"

33"The doctors' evidence necessarily cannot be very definite," said Poirot; "they are inclined to think that death was unlikely to have occurred after leaving Lyons. And we know this much, that a few moments after leaving Lyons Mrs. Kettering was dead."

34"How do you know that?"

35Poirot was smiling rather oddly to himself.

36"Some one else went into her compartment and found her dead."

37"And they did not rouse the train?"

38"No."

39"Why was that?"

40"Doubtless they had their reasons."

41Lenox looked at him sharply.

42"Do you know the reason?"

43"I think so—yes."

44Lenox sat still turning things over in her mind. Poirot watched her in silence. At last she looked up. A soft colour had come into her cheeks and her eyes were shining.

45"You think some one on the train must have killed her, but that need not be so at all. What is to stop any one swinging themselves on to the train when it stopped at Lyons? They could go straight to her compartment, strangle her, and take the rubies and drop off the train again without any one being the wiser. She may have been actually killed while the train was in Lyons station. Then she would have been alive when Derek went in, and dead when the other person found her."

46Poirot leant back in his chair. He drew a deep breath. He looked across at the girl and nodded his head three times, then he heaved a sigh.

47"Mademoiselle," he said, "what you have said there is very just—very true. I was struggling in darkness, and you have shown me a light. There was a point that puzzled me and you have made it plain."

48He got up.

49"And Derek?" said Lenox.

50"Who knows?" said Poirot, with a shrug of his shoulders. "But I will tell you this, Mademoiselle. I am not satisfied; no, I, Hercule Poirot, am not yet satisfied. It may be that this very night I shall learn something more. At least, I go to try."

51"You are meeting some one?"

52"Yes."

53"Some one who knows something?"

54"Some one who might know something. In these matters one must leave no stone unturned. Au revoir, Mademoiselle."

55Lenox accompanied him to the door.

56"Have I—helped?" she asked.

57Poirot's face softened as he looked up at her standing on the doorstep above him.

58"Yes, Mademoiselle, you have helped. If things are very dark, always remember that."

59When the car had driven off he relapsed into a frowning absorption, but in his eyes was that faint green light which was always the precursor of the triumph to be.

60He was a few minutes late at the rendezvous, and found that M. Papopolous and his daughter had arrived before him. His apologies were abject, and he outdid himself in politeness and small attentions. The Greek was looking particularly benign and noble this evening, a sorrowful patriarch of blameless life. Zia was looking handsome and good humoured. The dinner was a pleasant one. Poirot was his best and most sparkling self. He told anecdotes, he made jokes, he paid graceful compliments to Zia Papopolous, and he told many interesting incidents of his career. The menu was a carefully selected one, and the wine was excellent.

61At the close of dinner M. Papopolous inquired politely:

62"And the tip I gave you? You have had your little flutter on the horse?"

63"I am in communication with—er—my bookmaker," replied Poirot.

64The eyes of the two men met.

65"A well-known horse, eh?"

66"No," said Poirot; "it is what our friends, the English, call a dark horse."

67"Ah!" said M. Papopolous thoughtfully.

68"Now we must step across to the Casino and have our little flutter at the roulette table," cried Poirot gaily.

69At the Casino the party separated, Poirot devoting himself solely to Zia, whilst Papopolous himself drifted away.

70Poirot was not fortunate, but Zia had a run of good luck, and had soon won a few thousand francs.

71"It would be as well," she observed drily to Poirot, "if I stopped now."

72Poirot's eyes twinkled.

73"Superb!" he exclaimed. "You are the daughter of your father, Mademoiselle Zia. To know when to stop. Ah! that is the art."

74He looked round the rooms.

75"I cannot see your father anywhere about," he remarked carelessly. "I will fetch your cloak for you, Mademoiselle, and we will go out in the gardens."

76He did not, however, go straight to the cloak-room. His sharp eyes had seen but a little while before the departure of M. Papopolous. He was anxious to know what had become of the wily Greek. He ran him to earth unexpectedly in the big entrance hall. He was standing by one of the pillars, talking to a lady who had just arrived. The lady was Mirelle.

77Poirot sidled unostentatiously round the room. He arrived at the other side of the pillar, and unnoticed by the two who were talking together in an animated fashion—or rather, that is to say, the dancer was talking, Papopolous contributing an occasional monosyllable and a good many expressive gestures.

78"I tell you I must have time," the dancer was saying. "If you give me time I will get the money."

79"To wait"—the Greek shrugged his shoulders—"it is awkward."

80"Only a very little while," pleaded the other. "Ah! but you must! A week—ten days—that is all I ask. You can be sure of your affair. The money will be forthcoming."

81Papopolous shifted a little and looked round him uneasily—to find Poirot almost at his elbow with a beaming innocent face.

82"Ah! vous voilà, M. Papopolous. I have been looking for you. It is permitted that I take Mademoiselle Zia for a little turn in the gardens? Good evening, Mademoiselle." He bowed very low to Mirelle. "A thousand pardons that I did not see you immediately."

83The dancer accepted his greetings rather impatiently. She was clearly annoyed at the interruption of her tête-à-tête. Poirot was quick to take the hint. Papopolous had already murmured: "Certainly—but certainly," and Poirot withdrew forthwith.

84He fetched Zia's cloak, and together they strolled out into the gardens.

85"This is where the suicides take place," said Zia.

86Poirot shrugged his shoulders. "So it is said. Men are foolish, are they not, Mademoiselle? To eat, to drink, to breathe the good air, it is a very pleasant thing, Mademoiselle. One is foolish to leave all that simply because one has no money—or because the heart aches. L'amour, it causes many fatalities, does it not?"

87Zia laughed.

88"You should not laugh at love, Mademoiselle," said Poirot, shaking an energetic forefinger at her. "You who are young and beautiful."

89"Hardly that," said Zia; "you forget that I am thirty-three, M. Poirot. I am frank with you, because it is no good being otherwise. As you told my father, it is exactly seventeen years since you aided us in Paris that time."

90"When I look at you, it seems much less," said Poirot gallantly. "You were then very much as you are now, Mademoiselle, a little thinner, a little paler, a little more serious. Sixteen years old and fresh from your pension. Not quite the petite pensionnaire, not quite a woman. You were very delicious, very charming, Mademoiselle Zia; others thought so too, without doubt."

91"At sixteen," said Zia, "one is simple and a little fool."

92"That may be," said Poirot, "yes, that well may be. At sixteen one is credulous, is one not? One believes what one is told."

93If he saw the quick sideways glance that the girl shot at him, he pretended not to have done so. He continued dreamily: "It was a curious affair that, altogether. Your father, Mademoiselle, has never understood the true inwardness of it."

94"No?"

95"When he asked me for details, for explanations, I said to him thus: 'Without scandal, I have got back for you that which was lost. You must ask no questions.' Do you know, Mademoiselle, why I said these things?"

96"I have no idea," said the girl coldly.

97"It was because I had a soft spot in my heart for a little pensionnaire, so pale, so thin, so serious."

98"I don't understand what you are talking about," cried Zia angrily.

99"Do you not, Mademoiselle? Have you forgotten Antonio Pirezzio?"

100He heard the quick intake of her breath—almost a gasp.

101"He came to work as an assistant in the shop, but not thus could he have got hold of what he wanted. An assistant can lift his eyes to his master's daughter, can he not? If he is young and handsome with a glib tongue. And since they cannot make love all the time, they must occasionally talk of things that interest them both—such as that very interesting thing which was temporarily in M. Papopolous' possession. And since, as you say, Mademoiselle, the young are foolish and credulous, it was easy to believe him and to give him a sight of that particular thing, to show him where it was kept. And afterwards when it is gone—when the unbelievable catastrophe has happened. Alas! the poor little pensionnaire. What a terrible position she is in. She is frightened, the poor little one. To speak or not to speak? And then there comes along that excellent fellow, Hercule Poirot. Almost a miracle it must have been, the way things arranged themselves. The priceless heirlooms are restored and there are no awkward questions."

102Zia turned on him fiercely.

103"You have known all the time? Who told you? Was it—was it Antonio?"

104Poirot shook his head.

105"No one told me," he said quietly. "I guessed. It was a good guess, was it not, Mademoiselle? You see, unless you are good at guessing, it is not much use being a detective."

106The girl walked along beside him for some minutes in silence. Then she said in a hard voice:

107"Well, what are you going to do about it, are you going to tell my father?"

108"No," said Poirot sharply. "Certainly not."

109She looked at him curiously.

110"You want something from me?"

111"I want your help, Mademoiselle."

112"What makes you think that I can help you?"

113"I do not think so. I only hope so."

114"And if I do not help you, then—you will tell my father?"

115"But no, but no! Debarrass yourself of that idea, Mademoiselle. I am not a blackmailer. I do not hold your secret over your head and threaten you with it."

116"If I refuse to help you—" began the girl slowly.

117"Then you refuse, and that is that."

118"Then why—" she stopped.

119"Listen, and I will tell you why. Women, Mademoiselle, are generous. If they can render a service to one who has rendered a service to them, they will do it. I was generous once to you, Mademoiselle. When I might have spoken, I held my tongue."

120There was another silence; then the girl said, "My father gave you a hint the other day."

121"It was very kind of him."

122"I do not think," said Zia slowly, "that there is anything that I can add to that."

123If Poirot was disappointed he did not show it. Not a muscle of his face changed.

124"Eh bien!" he said cheerfully, "then we must talk of other things."

125And he proceeded to chat gaily. The girl was distraite, however, and her answers were mechanical and not always to the point. It was when they were approaching the Casino once more that she seemed to come to a decision.

126"M. Poirot?"

127"Yes, Mademoiselle?"

128"I—I should like to help you if I could."

129"You are very amiable, Mademoiselle—very amiable."

130Again there was a pause. Poirot did not press her. He was quite content to wait and let her take her own time.

131"Ah bah," said Zia, "after all, why should I not tell you? My father is cautious—always cautious in everything he says. But I know that with you it is not necessary. You have told us it is only the murderer you seek, and that you are not concerned over the jewels. I believe you. You were quite right when you guessed that we were in Nice because of the rubies. They have been handed over here according to plan. My father has them now. He gave you a hint the other day as to who our mysterious client was."

132"The Marquis?" murmured Poirot softly.

133"Yes, the Marquis."

134"Have you ever seen the Marquis, Mademoiselle Zia?"

135"Once," said the girl. "But not very well," she added. "It was through a keyhole."

136"That always presents difficulties," said Poirot sympathetically, "but all the same you saw him. You would know him again?"

137Zia shook her head.

138"He wore a mask," she explained.

139"Young or old?"

140"He had white hair. It may have been a wig, it may not. It fitted very well. But I do not think he was old. His walk was young, and so was his voice."

141"His voice?" said Poirot thoughtfully. "Ah, his voice! Would you know it again, Mademoiselle Zia?"

142"I might," said the girl.

143"You were interested in him, eh? It was that that took you to the keyhole."

144Zia nodded.

145"Yes, yes. I was curious. One had heard so much—he is not the ordinary thief—he is more like a figure of history or romance."

146"Yes," said Poirot thoughtfully, "yes; perhaps so."

147"But it is not this that I meant to tell you," said Zia. "It was just one other little fact that I thought might be—well—useful to you."

148"Yes?" said Poirot encouragingly.

149"The rubies, as I say, were handed over to my father here at Nice. I did not see the person who handed them over, but—"

150"Yes?"

151"I know one thing. It was a woman."