“Ah,” said Poirot, “it is my mistake. You will excuse me one little minute.”

He strolled across to where Lenox Tamplin was talking to Van Aldin and Knighton. The American looked old and haggard. He greeted Poirot with a curt nod but without any other sign of animation.

As he turned to reply to some observation made by Lenox, Poirot drew Knighton aside.

“ M. Van Aldin looks ill,” he said.

“Do you wonder?” asked Knighton. “The scandal of Derek Kettering’s arrest has about put the lid on things, as far as he is concerned. He is even regretting that he asked you to find out the truth.”

“He should go back to England,” said Poirot.

“We are going the day after tomorrow.”