The mystery of the Blue Train

by Agatha Christie

"No," said Poirot.

A look of utter astonishment came over Van Aldin's face.

"But why? What more do you want?"

"The Comte's alibi is still unshaken."

"But that is nonsense."

"Yes," said Poirot; "I rather think it is nonsense, but unfortunately we have to prove it so."

"In the meantime he will slip through your fingers."

Poirot shook his head very energetically.

"No," he said, "he will not do that. The one thing the Comte cannot afford to sacrifice is his social position. At all costs he must stop and brazen it out."

Van Aldin was still dissatisfied.