I realized that Poirot’s vanity was of the case-hardened variety which could withstand all attacks. I reminded him that once or twice the honours of the game had lain with our adversaries. But I might have known that it was impossible to diminish Hercule Poirot’s enthusiasm for his own methods.

“See you, Hastings, it is like the little trick that you play with the cards. You have seen it without doubt? You take the four knaves, you divide them, one on top of the pack, one underneath, and so on⁠—you cut and you shuffle, and there they are all together again. That is my object. So far I have been contending, now against one of the Big Four, now against another. But let me get them all together, like the four knaves in the pack of cards, and then, with one coup, I destroy them all!”

“And how do you propose to get them all together?” I asked.

“By awaiting the supreme moment. By lying perdu until they are ready to strike.”