But did everyone suspect him? What about Mrs. Cavendish? I watched her as she sat at the head of the table, graceful, composed, enigmatic. In her soft grey frock, with white ruffles at the wrists falling over her slender hands, she looked very beautiful. When she chose, however, her face could be sphinxlike in its inscrutability. She was very silent, hardly opening her lips, and yet in some queer way I felt that the great strength of her personality was dominating us all.

And little Cynthia? Did she suspect? She looked very tired and ill, I thought. The heaviness and languor of her manner were very marked. I asked her if she were feeling ill, and she answered frankly:

“Yes, I’ve got the most beastly headache.”

“Have another cup of coffee, mademoiselle?” said Poirot solicitously. “It will revive you. It is unparalleled for the mal de tête .” He jumped up and took her cup.