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 “It was Ivan who opened the door to you—and he has already said to me that in his opinion Gilmour Wilson did not die a natural death—that he was poisoned by mistake.”

“By mistake.”

“Yes, the poison was meant for my uncle.”

She had quite forgotten her first distrust now, and was speaking eagerly.

“Why do you say that, mademoiselle. Who should wish to poison Dr. Savaronoff?”

She shook her head.

“I do not know. I am all in the dark. And my uncle, he will not trust me. It is natural, perhaps. You see, he hardly knows me. He saw me as a child, and not since till I came to live with him here in London. But this much I do know, he is in fear of something. We have many secret societies in Russia, and one day I overheard something which made me think it was of just such a society he went in fear. Tell me, monsieur”—she came a step nearer, and dropped her voice—“have you ever heard of a society called the ‘Big Four’?”

Poirot jumped nearly out of his skin. His eyes positively bulged with astonishment.

“Why do you—what do you know of the Big Four, mademoiselle?”

“There is such an association, then! I