Knighton looked at him in some surprise.

“You are quite right,” he confessed. “I don’t know how you knew it, though.”

“It showed itself only too plainly,” said Poirot drily.

“I did not know that I was so transparent.”

“It is my business to observe the physiognomy,” the little man explained, with dignity.

“I will tell you, M. Poirot. You have heard of this dancer woman⁠—Mirelle?”

“She who is the chère amie of M. Derek Kettering?”