“What were you doing there?” I asked, in lively curiosity.

“I left something to be analysed.”

“Yes, but what?”

“The sample of cocoa I took from the saucepan in the bedroom.”

“But that has already been tested!” I cried, stupefied. “Dr. Bauerstein had it tested, and you yourself laughed at the possibility of there being strychnine in it.”

“I know Dr. Bauerstein had it tested,” replied Poirot quietly.

“Well, then?”

“Well, I have a fancy for having it analysed again, that is all.”

And not another word on the subject could I drag out of him.

This proceeding of Poirot’s, in respect of the cocoa, puzzled me intensely. I could see neither rhyme nor reason in it. However, my confidence in him, which at one time had rather waned, was fully restored since his belief in Alfred Inglethorp’s innocence had been so triumphantly vindicated.