"You said there was a third method," I reminded him.
"Ah yes. For that one needs the utmost ingenuity. You have to guess exactly how and when the blow is timed to fall and you have to be ready to step in at the exact psychological moment. You have to catch the murderer, if not quite red-handed, then guilty of the intention beyond any possible doubt.
"And that, my friend," went on Poirot, "is, I can assure you, a matter of great difficulty and delicacy, and I would not for a moment guarantee its success! I may be conceited, but I am not so conceited as that."
"Which method do you propose to try here?"
"Possibly all three. The first is the most difficult."
"Why? I should have thought it the easiest."
"Yes, if you know the intended victim. But do you not realize, Hastings, that here I do not know the victim?"
"What?"
I gave vent to the exclamation without reflecting. Then the difficulties of the position began to dawn on me. There was, there must be, some link connecting this series of crimes, but we did not know what that link was. The motive, the vitally important motive, was missing. And without knowing that, we could not tell who was threatened.
Poirot nodded as he saw by my face that I was realizing the difficulties of the situation.
"You see, my friend, it is not so easy."
"No," I said. "I see that. You have so far been able to find no connection between these varying cases?"
Poirot shook his head.
"Nothing."
I reflected again. In the A.B.C. crimes, we had to deal with what purported to be an alphabetical series, though in actuality it had turned out to be something very different.
I asked:
"There is, you are quite sure, no far-fetched financial motive – nothing, for instance, like you found in the case of Evelyn Carlisle?"
"No. You may be quite sure, my dear Hastings, that financial gain is the first thing for which I look."
That was true enough. Poirot has always been completely cynical about money.
I thought again. A vendetta of some kind? That was more in accordance with the facts. But even there, there seemed a lack of any connecting link. I recalled a story I had read of a series of purposeless murders – the clue being that the victims had happened to serve as members of a jury, and the crimes had been committed by a man whom they had condemned. It struck me that something of that kind would meet this case. I am ashamed to say that I kept the idea to myself. It would have been such a feather in my cap if I could go to Poirot with the solution.
Instead I asked:
"And now tell me, who is X?"
To my intense annoyance Poirot shook his head very decidedly.
"That, my friend, I do not tell."
"Nonsense. Why not?"
Poirot's eyes twinkled.
"Because, mon cher, you are still the same old Hastings. You have still the speaking countenance. I do not wish, you see, that you should sit staring at X with your mouth hanging open, your face saying plainly: 'This – this that I am looking at is a murderer.'"
"You might give me credit for a little dissimulation at need."
"When you try to dissimulate, it is worse. No, no, mon ami, we must be very incognito, you and I. Then, when we pounce, we pounce."
"You obstinate old devil," I said. "I've a good mind to -"
I broke off as there was a tap on the door. Poirot called, "Come in," and my daughter Judith entered.
I should like to describe Judith, but I've always been a poor hand at descriptions.
Judith is tall, she holds her head high, she has level dark brows and a very lovely line of cheek and jaw – severe in its austerity. She is grave and slightly scornful, and to my mind there has always hung about her a suggestion of tragedy.
Judith didn't come and kiss me – she is not that kind. She just smiled at me and said, "Hullo, Father."
Her smile was shy and a little embarrassed, but it made me feel that in spite of her undemonstrativeness she was pleased to see me.
"Well," I said, feeling foolish as I so often do with the younger generation, "I've got here."
"Very clever of you, darling," said Judith.
"I describe to him," said Poirot, "the cooking."
"Is it very bad?" asked Judith.
"You should not have to ask that, my child. Is it that you think of nothing but the test tubes and the microscopes? Your middle finger, it is stained with methylene blue. It is not a good thing for your husband if you take no interest in his stomach."
"I daresay I shan't have a husband."
"Certainly you will have a husband. What did the bon Dieu create you for?"
"Many things, I hope," said Judith.
"Le mariage first of all."
"Very well," said Judith. "You shall find me a nice husband and I will look after his stomach very carefully."
"She laughs at me," said Poirot. "Someday she will know how wise old men are."
There was another tap on the door and Dr Franklin entered. He was a tall, angular young man of thirty-five, with a decided jaw, reddish hair, and bright blue eyes. He was the most ungainly man I had ever known, and was always knocking into things in an absent-minded way.
He cannoned into the screen round Poirot's chair and half turning his head murmured "I beg your pardon" to it automatically.
I wanted to laugh, but Judith, I noted, remained quite grave. I suppose she was quite used to that sort of thing.
"You remember my father," said Judith.
Dr Franklin started, shied nervously, screwed up his eyes and peered at me, then stuck out a hand, saying awkwardly:
"Of course, of course, how are you? I heard you were coming down."
He turned to Judith.
"I say, do you think we need change? If not, we might go on a bit after dinner. If we got a few more of those slides prepared -"
"No," said Judith. "I want to talk to my father."
"Oh yes. Oh, of course." Suddenly he smiled, an apologetic boyish smile. "I am sorry – I get so awfully wrapped up in a thing. It's quite unpardonable – makes me so selfish. Do forgive me."
The clock struck and Franklin glanced at it hurriedly.
"Good Lord, is it as late as that? I shall get into trouble. Promised Barbara I'd read to her before dinner."
He grinned at us both and hurried out, colliding with the doorpost as he went out.
"How is Mrs Franklin?" I asked.
"The same and rather more so," said Judith.
"It's very sad her being such an invalid," I said.
"It's maddening for a doctor," said Judith. "Doctors like healthy people."
"How hard you young people are!" I exclaimed.
Judith said coldly:
"I was just stating a fact."
"Nevertheless," said Poirot, "the good doctor hurries to read to her."
"Very stupid," said Judith. "That nurse of hers can read to her perfectly well if she wants to be read to. Personally I should loathe anyone reading aloud to me."
"Well, well, tastes differ," I said.
"She's a very stupid woman," said Judith.
"Now there, mon enfant," said Poirot, "I do not agree with you."
"She never reads anything but the cheapest kind of novel. She takes no interest in his work. She doesn't keep abreast of current thought. She just talks about her health to everyone who will listen."
"I still maintain," said Poirot, "that she uses her grey cells in ways that you, my child, know nothing about."
"She's a very feminine sort of woman," said Judith. "She coos and purrs. I expect you like 'em like that, Uncle Hercule."
"Not at all," I said. "He likes them large and flamboyant and Russian for choice."
"So that is how you give me away, Hastings? Your father, Judith, has always had a penchant for auburn hair. It has landed him in trouble many a time."
Judith smiled at us both indulgently. She said:
"What a funny couple you are."
She turned away and I rose.