It was suggested that as the crime was committed presumably while the train was in motion, only those in the one car could be implicated.

“We should never jump to conclusions,” said the Chief snappishly.  “Well, show me the train card—­the list of the travellers in the sleeper.”

“It cannot be found, sir.”

“Impossible!  Why, it is the porter’s business to deliver it at the end of the journey to his superiors, and under the law—­to us.  Where is the porter?  In custody?”

“Surely, sir, but there is something wrong with him.”

“So I should think!  Nothing of this kind could well occur without his knowledge.  If he was doing his duty—­unless, of course, he—­but let us avoid hasty conjectures.”

“He has also lost the passengers’ tickets, which you know he retains till the end of the journey.  After the catastrophe, however, he was unable to lay his hand upon his pocket-book.  It contained all his papers.”

“Worse and worse.  There is something behind all this.  Take me to him.  Stay, can I have a private room close to the other—­where the prisoners, those held on suspicion, are?  It will be necessary to hold investigations, take their depositions.  M. le Juge will be here directly.”

M. Flocon was soon installed in a room actually communicating with the waiting-room, and as a preliminary of the first importance, taking precedence even of the examination of the sleeping-car, he ordered the porter to be brought in to answer certain questions.

The man, Ludwig Groote, as he presently gave his name, thirty-two years of age, born at Amsterdam, looked such a sluggish, slouching, blear-eyed creature that M. Flocon began by a sharp rebuke.

“Now.  Sharp!  Are you always like this?” cried the Chief.

The porter still stared straight before him with lack-lustre eyes, and made no immediate reply.

“Are you drunk? are you—­Can it be possible?” he said, and in vague reply to a sudden strong suspicion, he went on: 

“What were you doing between Laroche and Paris?  Sleeping?”

The man roused himself a little.  “I think I slept.  I must have slept.  I was very drowsy.  I had been up two nights; but so it is always, and I am not like this generally.  I do not understand.”

“Hah!” The Chief thought he understood.  “Did you feel this drowsiness before leaving Laroche?”

“No, monsieur, I did not.  Certainly not.  I was fresh till then—­quite fresh.”

“Hum; exactly; I see;” and the little Chief jumped to his feet and ran round to where the porter stood sheepishly, and sniffed and smelt at him.

“Yes, yes.”  Sniff, sniff, sniff, the little man danced round and round him, then took hold of the porter’s head with one hand, and with the other turned down his lower eyelid so as to expose the eyeball, sniffed a little more, and then resumed his seat.

“Exactly.  And now, where is your train card?”