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 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 to-morrow, eleven was the time, and four was the signature—either referring to the mysterious Number Four himself—or else it was the “trade-mark” 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 jeopardise 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 post haste 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