I puzzled over the letter all that evening, and most of the next day—and then suddenly the solution came to me. It was so simple, too. The figure 4 was the clue. Read every fourth word in the letter, and an entirely different message appeared. “Essential should see you quarry seventeen eleven four.”
The solution of the figures was easy. Seventeen stood for the seventeenth of October—which was tomorrow, eleven was the time, and four was the signature—either referring to the mysterious Number Four himself—or else it was the “trademark,” so to speak, of the Big Four. The quarry was also intelligible. There was a big disused quarry on the estate about half a mile from the house—a lonely spot, ideal for a secret meeting.
For a moment or two I was tempted to run the show myself. It would be such a feather in my cap, for once, to have the pleasure of crowing over Poirot.
But in the end I overcame the temptation. This was a big business—I had no right to play a lone hand, and perhaps jeopardize our chances of success. For the first time, we had stolen a march upon our enemies. We must make good this time—and, disguise the fact as I might, Poirot had the better brain of the two.
I wrote off posthaste to him, laying the facts before him, and explaining how urgent it was that we should overhear what went on at the interview. If he liked to leave it to me, well and good, but I gave him detailed instructions how to reach the quarry from the station in case he should deem it wise to be present himself.
I took the letter down to the village and posted it myself. I had been able to communicate with Poirot throughout my stay, by the simple expedient of posting my letters myself, but we agreed that he should not attempt to communicate with me in case my letters should be tampered with.
I was in a glow of excitement the following evening. No guests were staying in the house, and I was busy with Mr. Ryland in his study all the evening. I had foreseen that this would be the case, which was why I had had no hope of being able to meet Poirot at the station. I was, however, confident that I would be dismissed well before eleven o’clock.
Sure enough, just after ten-thirty, Mr. Ryland glanced at the clock, and announced that he was “through.” I took the hint and retired discreetly. I went upstairs as though going to bed, but slipped quietly down a side staircase and let myself out into the garden, having taken the precaution to don a dark overcoat to hide my white shirtfront.
I had gone some way down the garden when I chanced to look over my shoulder. Mr. Ryland was just stepping out from his study window into the garden. He was starting to keep the appointment. I redoubled my pace, so as to get a clear start. I arrived at the quarry somewhat out of breath. There seemed no one about, and I crawled into a thick tangle of bushes and awaited developments.
Ten minutes later, just on the stroke of eleven, Ryland stalked up, his hat over his eyes and the inevitable cigar in his mouth. He gave a quick look round, and then plunged into the hollows of the quarry below. Presently I heard a low murmur of voices come up to me. Evidently the other man—or men—whoever they were, had arrived first at the rendezvous. I crawled cautiously out of the bushes, and inch by inch, using the utmost precaution against noise, I wormed myself down the steep path. Only a boulder now separated me from the talking men. Secure in the blackness, I peeped round the edge of it and found myself facing the muzzle of a black, murderous-looking automatic!
“Hands up!” said Mr. Ryland succinctly. “I’ve been waiting for you.”
He was seated in the shadow of the rock, so that I could not see his face, but the menace in his voice was unpleasant. Then I felt a ring of cold steel on the back of my neck, and Ryland lowered his own automatic.
“That’s right, George,” he drawled. “March him around here.”
Raging inwardly, I was conducted to a spot in the shadows, where the unseen George (whom I suspected of being the impeccable Deaves) gagged and bound me securely.
Ryland spoke again in a tone which I had difficulty in recognizing, so cold and menacing was it.
“This is going to be the end of you two. You’ve got in the way of the Big Four once too often. Ever heard of landslides? There was one about here two years ago. There’s going to be another tonight. I’ve fixed that good and square. Say, that friend of yours doesn’t keep his dates very punctually.”
A wave of horror swept over me. Poirot! In another minute he would walk straight into the trap. And I was powerless to warn him. I could only pray that he had elected to leave the matter in my hands, and had remained in London. Surely, if he had been coming, he would have been here by now.
With every minute that passed, my hopes rose.
Suddenly they were dashed to pieces. I heard footsteps—cautious footsteps, but footsteps nevertheless. I writhed in impotent agony. They came down the path, paused, and then Poirot himself appeared, his head a little on one side, peering into the shadows.
I heard the growl of satisfaction Ryland gave as he raised the big automatic and shouted, “Hands up.” Deaves sprang forward as he did so, and took Poirot in the rear. The ambush was complete.
“Pleased to meet you, Mr. Hercule Poirot,” said the American grimly.
Poirot’s self-possession was marvellous. He did not turn a hair. But I saw his eyes searching in the
