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 accuse either Ryland or Madame Olivier—who would believe me? You remember I thought once I had Ryland successfully cornered? Nevertheless I have made my suspicions known in certain quarters—the highest—Lord Aldington, who enlisted my help in the matter of the stolen submarine plans, is fully cognisant of all my information respecting the Big Four—and while others may doubt, he believes. Ryland and Madame Olivier, and Li Chang Yen himself may go their ways, but there is a searchlight turned on all their movements.”

“And Number Four?” I asked.

“As I said just now—I am beginning to know and understand his methods. You may smile, Hastings—but to penetrate a man’s personality, to know exactly what he will do under any given circumstances—that is the beginning of success. It is a duel between us, and whilst he is constantly giving away his mentality to me, I endeavour to let him know little or nothing of mine. He is in the light, I in the shade. I tell you, Hastings, that every day they fear me the more for my chosen inactivity.”

“They’ve let us alone, anyway,” I observed. “There have been no more attempts on your life, and no ambushes of any kind.”

“No,” said Poirot thoughtfully. “On the