Poirot shrugged his shoulders. "They take their course," he said.
"And you are just letting them take their course?"
He looked at Lenox a little sadly.
"You are young, Mademoiselle, but there are three things that cannot be hurried—le bon Dieu, Nature, and old people."
"Nonsense!" said Lenox. "You are not old."
"Ah, it is pretty what you say there."
"Here is Major Knighton," said Lenox.
Katherine looked round quickly and then turned back again.
"He is with Mr. Van Aldin," continued Lenox. "There is something I want to ask Major Knighton about. I won't be a minute."
Left alone together, Poirot bent forward and murmured to Katherine: