I was about to expound these theories to Poirot, when his own words distracted me.

“Come,” he said, “now to examine the coffee-cups!”

“My dear Poirot! What on earth is the good of that, now that we know about the cocoa?”

“Oh, la la! That miserable cocoa!” cried Poirot flippantly.

He laughed with apparent enjoyment, raising his arms to heaven in mock despair, in what I could not but consider the worst possible taste.

“And, anyway,” I said, with increasing coldness, “as Mrs. Inglethorp took her coffee upstairs with her, I do not see what you expect to find, unless you consider it likely that we shall discover a packet of strychnine on the coffee tray!”

Poirot was sobered at once.