“Well, I don’t quite know what I was going to say. Do you think I forgot to put my watch back too?”
“No, Madame. I think you heard the man pass through—but unconsciously. Later you had a nightmare of a man being in your compartment and woke up with a start and rang for the conductor.”
“Well, I suppose that’s possible,” admitted Mrs. Hubbard.
Princess Dragomiroff was looking at Poirot with a very direct glance. “How do you explain the evidence of my maid, Monsieur?”
“Very simply, Madame. Your maid recognised the handkerchief I showed her as yours. She somewhat clumsily tried to shield you. She did encounter the man, but earlier—while the train was at Vincovci station. She pretended to have seen him at a later hour, with a confused idea of giving you a water-tight alibi.”
The Princess bowed her head. “You have thought of everything, Monsieur. I—I admire you.”
There was a silence.
Then everyone jumped as Dr. Constantine suddenly hit the table a blow with his fist.
“But no,” he said. “No, no, and again no! That is an explanation that will not hold water. It is deficient in a dozen minor points. The crime was not committed so—M. Poirot must know that perfectly well.”
Poirot turned a curious glance on him. “I see,” he said, “that I shall have to give you my second solution. But do not abandon this one too abruptly. You may agree with it later.”
He turned back again to face the others.
“There is another possible solution of the crime. This is how I arrived at it.
“When I had heard all the evidence, I leaned back and shut my eyes, and began to think. Certain points presented themselves to me as worthy of attention. I enumerated these points to my two colleagues. Some I have already elucidated—such as a grease spot on a passport, and so on. I will run over the points that remain. The first and most important is a remark made to me by M. Bouc in the restaurant car at lunch on the first day after leaving Stamboul—to the effect that the company assembled was interesting because it was so varied—representing as it did all classes and nationalities.
“I agreed with him, but when this particular point came into my mind, I tried to imagine whether such an assembly was ever likely to be collected under any other conditions. And the answer I made to myself was—only in America. In America there might be a household composed of just such varied nationalities—an Italian chauffeur, an English governess, a Swedish nurse, a German lady’s-maid, and so on. That led me to my scheme of ‘guessing’—that is, casting each person for a certain part in the Armstrong drama much as a producer casts a play. Well, that gave me an extremely interesting and satisfactory result.
“I had also examined in my own mind each separate person’s evidence, with some curious results. Take first the evidence of Mr. MacQueen. My first interview with him was entirely satisfactory. But in my second he made rather a curious remark. I had described to him the finding of a note mentioning the Armstrong case. He said, ‘But surely—’ and then paused and went on, ‘I mean—that was rather careless of the old man.’
“Now I could feel that that was not what he had started out to say. Supposing what he had meant to say was ‘But surely that was burnt!’ In which case, MacQueen knew of the note and of its destruction—in other words, he was either the murderer or an accomplice of the murderer. Very good.
“Then the valet. He said his master was in the habit of taking a sleeping draught when travelling by train. That might be true, but would Ratchett have taken one last night? The automatic under his pillow gave the lie to that statement. Ratchett intended to be on the alert last night. Whatever narcotic was administered to him must have been given without his knowledge. By whom? Obviously by MacQueen or the valet.
“Now we come to the evidence of Mr. Hardman. I believed all that he told me about his own identity, but when it came to the actual methods he had employed to guard Mr. Ratchett, his story was neither more nor less than absurd. The only way to have protected Ratchett effectively was to pass the night actually in his compartment or in some spot where he could watch the door. The one thing that his evidence did show plainly was that no one in any other part of the train could possibly have murdered Ratchett. It drew a clear circle round the Stamboul-Calais carriage. That seemed to me a rather curious and inexplicable fact, and I put it aside to think over.