“ Chère Mademoiselle Katherine ” (it began)⁠—“I trust that you are in good health and that the return to the English winter has not proved too depressing. Me, I prosecute my inquiries with the utmost diligence. Do not think that it is the holiday that I take here. Very shortly I shall be in England, and I hope then to have the pleasure of meeting you once more. It shall be so, shall it not? On arrival in London I shall write to you. You remember that we are the colleagues in this affair? But indeed I think you know that very well. Be assured, Mademoiselle, of my most respectful and devoted sentiments.

“Hercule Poirot.”

Katherine frowned slightly. It was as though something in the letter puzzled and intrigued her.