Katherine looked up with a sudden air of resolution.
"What were you doing in Paris, Monsieur Poirot?"
Poirot smiled slightly.
"I made a call at the Russian Embassy."
"Oh."
"I see that that tells you nothing. But I will not be a human oyster. No, I will lay my cards on the table, which is assuredly a thing that oysters do not do. You suspect, do you not, that I am not satisfied with the case against Derek Kettering?"
"That is what I have been wondering. I thought, in Nice, that you had finished with the case."
"You do not say all that you mean, Mademoiselle. But I admit everything. It was I—my researches—which placed Derek Kettering where he is now. But for me the Examining Magistrate would still be vainly trying to fasten the crime on the Comte de la Roche. Eh bien, Mademoiselle, what I have done I do not regret. I have only one duty—to discover the truth, and that way led straight to Mr. Kettering. But did it end there? The police say yes, but I, Hercule Poirot, am not satisfied."
He broke off suddenly. "Tell me, Mademoiselle, have you heard from Mademoiselle Lenox lately?"
"One very short, scrappy letter. She is, I think, annoyed with me for coming back to England."