“What two people?”

“Your friend Miss Grey was one of them. The other was Mademoiselle Mirelle, the dancer.”

“And he, Derek, what has he got to say about it?” demanded Lenox sharply.

“He denies having entered his wife’s compartment at all,” said Poirot.

“Fool!” said Lenox crisply, frowning. “Just before Lyons, you say? Does nobody know when⁠—when she died?”

“The doctors’ evidence necessarily cannot be very definite,” said Poirot; “they are inclined to think that death was unlikely to have occurred after leaving Lyons. And we know this much, that a few moments after leaving Lyons Mrs. Kettering was dead.”

“How do you know that?”