“Exactly. One thing her evidence has shown me. I made a mistake. Dorcas was quite right. The quarrel did take place earlier in the afternoon, about four o’clock, as she said.”

I looked at him curiously. I had never understood his insistence on that point.

“Yes, a good deal that was peculiar came out today,” continued Poirot. “ Dr. Bauerstein, now, what was he doing up and dressed at that hour in the morning? It is astonishing to me that no one commented on the fact.”

“He has insomnia, I believe,” I said doubtfully.

“Which is a very good, or a very bad explanation,” remarked Poirot. “It covers everything, and explains nothing. I shall keep my eye on our clever Dr. Bauerstein.”