she went to bed, and have got up later, towards morning, and bolted it then.”
“Poirot, is that seriously your opinion?”
“No, I do not say it is so, but it might be. Now, to turn to another feature, what do you make of the scrap of conversation you overheard between Mrs. Cavendish and her mother-in-law?”
“I had forgotten that,” I said thoughtfully. “That is as enigmatical as ever. It seems incredible that a woman like Mrs. Cavendish, proud and reticent to the last degree, should interfere so violently in what was certainly not her affair.”
“Yes, sir. Thank you, sir.”
“How did you know that Mrs. Inglethorp took sleeping powders?” I asked, in lively curiosity, as Dorcas left the room. “And about the lost key and the duplicate?”
“One thing at a time. As to the sleeping powders, I knew by this.” He suddenly produced a small cardboard box, such as chemists use for powders.