“It is certainly curious,” I agreed. “Still, it is unimportant, and need not be taken into account.”

A groan burst from Poirot.

“What have I always told you? Everything must be taken into account. If the fact will not fit the theory⁠—let the theory go.”

“Well, we shall see,” I said, nettled.

“Yes, we shall see.”

We had reached Leastways Cottage, and Poirot ushered me upstairs to his own room. He offered me one of the tiny Russian cigarettes he himself occasionally smoked. I was amused to notice that he stowed away the used matches most carefully in a little china pot. My momentary annoyance vanished.

Poirot had placed our two chairs in front of the open window which commanded a view of the village street. The fresh air blew in warm and pleasant. It was going to be a hot day.