There was a hint of reproach in his tone which was not lost upon the other.

“Yes, yes, of course,” he said. “When do you wish to start, Monsieur Poirot?”

“You are very busy at present, sir,” murmured Knighton.

But the millionaire had now made up his mind, and he waved the other’s objections aside.

“I guess this business comes first,” he said. “All right, Monsieur Poirot, tomorrow. What train?”

“We will go, I think, by the Blue Train,” said Poirot, and he smiled.