Poirot came to them in a moment or two, full of abject apologies and clearly so crestfallen that harsh words would have been superfluous. Van Aldin received his apologies gravely, but managed to restrain himself from making acid comments.

They had dinner on the train, and afterwards, somewhat to the surprise of the other two, Poirot suggested that they should all three sit up in Van Aldin’s compartment.

The millionaire looked at him curiously.

“Is there anything that you are keeping back from us, Monsieur Poirot?”

“I?” Poirot opened his eyes in innocent surprise. “But what an idea.”