"Oh, really? Camouflage contrived by whom?"

"By Mathias de Gorne himself."

"That's curious! And with what object?"

"With the object of pa.s.sing himself off for dead and of arranging subsequent matters in such a way that M. Vignal was bound to be accused of the death, the murder."

"An ingenious theory," the deputy agreed, still in a satirical tone. "What do you think of it, M. Vignal?"

"It is a theory which flashed through my own mind. Mr. Deputy," replied Jerome. "It is quite likely that, after our struggle and after I had gone, Mathias de Gorne conceived a new plan by which, this time, his hatred would be fully gratified. He both loved and detested his wife. He held me in the greatest loathing. This must be his revenge."

"His revenge would cost him dear, considering that, according to your statement, Mathias de Gorne was to receive a second sum of sixty thousand francs from you."

"He would receive that sum in another quarter, Mr. Deputy. My examination of the financial position of the de Gorne family revealed to me the fact that the father and son had taken out a life-insurance policy in each other's favour. With the son dead, or pa.s.sing for dead, the father would receive the insurance-money and indemnify his son."

"You mean to say," asked the deputy, with a smile, "that in all this camouflage, as you call it, M. de Gorne the elder would act as his son's accomplice?"

Renine took up the challenge:

"Just so, Mr. Deputy. The father and son are accomplices.

"Then we shall find the son at the father's?"

"You would have found him there last night."

"What became of him?"

"He took the train at Pompignat."

"That's a mere supposition."

"No, a certainty."

"A moral certainty, perhaps, but you'll admit there's not the slightest proof."

The deputy did not wait for a reply. He considered that he had displayed an excessive goodwill and that patience has its limits and he put an end to the interview:

"Not the slightest proof," he repeated, taking up his hat. "And, above all, ... above all, there's nothing in what you've said that can contradict in the very least the evidence of that relentless witness, the snow. To go to his father, Mathias de Gorne must have left this house. Which way did he go?"

"Hang it all, M. Vignal told you: by the road which leads from here to his father's!"

"There are no tracks in the snow."

"Yes, there are."

"But they show him coming here and not going away from here."

"It's the same thing."

"What?"

"Of course it is. There's more than one way of walking. One doesn't always go ahead by following one's nose."

"In what other way can one go ahead?"

"By walking backwards, Mr. Deputy."

These few words, spoken very simply, but in a clear tone which gave full value to every syllable, produced a profound silence. Those present at once grasped their extreme significance and, by adapting it to the actual happenings, perceived in a flash the impenetrable truth, which suddenly appeared to be the most natural thing in the world.

Renine continued his argument. Stepping backwards in the direction of the window, he said:

"If I want to get to that window, I can of course walk straight up to it; but I can just as easily turn my back to it and walk that way. In either case I reach my goal."

And he at once proceeded in a vigorous tone:

"Here's the gist of it all. At half-past eight, before the snow fell, M. de Gorne comes home from his father's house. M. Vignal arrives twenty minutes later. There is a long discussion and a struggle, taking up three hours in all. It is then, after M. Vignal has carried off Madame de Gorne and made his escape, that Mathias de Gorne, foaming at the mouth, wild with rage, but suddenly seeing his chance of taking the most terrible revenge, hits upon the ingenious idea of using against his enemy the very snowfall upon whose evidence you are now relying. He therefore plans his own murder, or rather the appearance of his murder and of his fall to the bottom of the well and makes off backwards, step by step, thus recording his arrival instead of his departure on the white page."

The deputy sneered no longer. This eccentric intruder suddenly appeared to him in the light of a person worthy of attention, whom it would not do to make fun of. He asked:

"And how could he have left his father's house?"

"In a trap, quite simply."

"Who drove it?"

"The father. This morning the sergeant and I saw the trap and spoke to the father, who was going to market as usual. The son was hidden under the tilt. He took the train at Pompignat and is in Paris by now."

Renine's explanation, as promised, had taken hardly five minutes. He had based it solely on logic and the probabilities of the case. And yet not a jot was left of the distressing mystery in which they were floundering. The darkness was dispelled. The whole truth appeared.

Madame de Gorne wept for joy and Jerome Vignal thanked the good genius who was changing the course of events with a stroke of his magic wand.

"Shall we examine those footprints together, Mr. Deputy?" asked Renine. "Do you mind? The mistake which the sergeant and I made this morning was to investigate only the footprints left by the alleged murderer and to neglect Mathias de Gorne's. Why indeed should they have attracted our attention?

Yet it was precisely there that the crux of the whole affair was to be found."

They stepped into the orchard and went to the well. It did not need a long examination to observe that many of the footprints were awkward, hesitating, too deeply sunk at the heel and toe and differing from one another in the angle at which the feet were turned.

"This clumsiness was unavoidable," said Renine. "Mathias de Gorne would have needed a regular apprenticeship before his backward progress could have equalled his ordinary gait; and both his father and he must have been aware of this, at least as regards the zigzags which you see here since old de Gorne went out of his way to tell the sergeant that his son had had too much drink." And he added "Indeed it was the detection of this falsehood that suddenly enlightened me. When Madame de Gorne stated that her husband was not drunk, I thought of the footprints and guessed the truth."

The deputy frankly accepted his part in the matter and began to laugh:

"There's nothing left for it but to send detectives after the bogus corpse."

"On what grounds, Mr. Deputy?" asked Renine. "Mathias de Gorne has committed no offence against the law. There's nothing criminal in trampling the soil around a well, in shifting the position of a revolver that doesn't belong to you, in firing three shots or in walking backwards to one's father's house. What can we ask of him? The sixty thousand francs? I presume that this is not M. Vignal's intention and that he does not mean to bring a charge against him?"

"Certainly not," said Jerome.

"Well, what then? The insurance-policy in favour of the survivor? But there would be no misdemeanour unless the father claimed payment. And I should be greatly surprised if he did.... Hullo, here the old chap is! You'll soon know all about it."

Old de Gorne was coming along, gesticulating as he walked. His easy-going features were screwed up to express sorrow and anger.