The mystery of the Blue train

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At Cook's, Katherine discovered that she had to queue for her ticket to the Riviera. Everyone seemed to be going there - including the man in front of her ... and Hercule Poirot. He turned aside abruptly and she stepped into his place. In some vague way the man's face was familiar to her. Where had she seen him before? Ah, yes, it was in the Savoy outside her room this morning. She glanced over her shoulder, made unease by some nameless thing. The man was standing in the doorway staring back at her. A cold shiver passed over Katherine; she had a haunting sense of sadness, of impending tragedy ...