waved the other's objections aside。
〃I guess this business es first；〃 he said。 〃All right； Monsieur Poirot； tomorrow。 What train？〃
〃We will go； I think； by the Blue Train；〃 said Poirot； and he smiled。
Chapter 34
THE BLUE TRAIN AGAIN
'The millionaire's train；' as it is sometimes called； swung round a curve of line at what seemed a dangerous speed。 Van Aldin； Knighton and Poirot sat together in silence。
Knighton and Van Aldin had two partments connecting with each other； as Ruth Kettering and her maid had had on the fateful journey。 Poirot's own partment was further along the coach。
The journey was a painful one for Van Aldin； recalling as it did the most agonizing memories。 Poirot and Knighton conversed occasionally in low tones without disturbing him。
When； however； the train had pleted its slow journey round the ceinture and reached the Gare de Lyon； Poirot became suddenly galvanized into activity。 Van Aldin realized that part of his object in travelling by the train had been to attempt to reconstruct the crime。 Poirot himself acted every part。 He was in turn the maid； hurriedly shut into her own partment； Mrs Kettering； recognizing her husband with surprise and a trace of anxiety； and Derek Kettering discovering that his wife was travelling on the train。 He tested various possibilities； such as the best way for a person to conceal himself in the second partment。
Then suddenly an idea seemed to strike him。 He clutched at Van Aldin's arm。
〃Mon Dieu； but that is something I have not thought of！ We must break our journey in Paris。 Quick； quick； let us alight at once。〃
Seizing suitcases he hurried from the train。 Van Aldin and Knighton； bewildered but obedient； followed him。 Van Aldin having once