"What do you mean by your pure reason?"

"That power of one's mind which admits of no disturbing elements to a conclusion. The day following the incident of 'the inexplicable gallery,' I felt myself losing control of it. I had allowed myself to be diverted by fallacious evidence; but I recovered and again took hold of the right end. I satisfied myself that the murderer could not have left the gallery, either naturally or supernaturally. I narrowed the field of consideration to that small circle, so to speak. The murderer could not be outside that circle. Now who was in it? There was, first, the murderer. Then there were Daddy Jacques, Monsieur Stangerson, Frederic Larsan, and myself. Five persons in all, counting in the murderer. And yet, in the gallery, there were but four. Now since it had been demonstrated to me that the fifth could not have escaped, it was evident that one of the four present in the gallery must be a double-he must be himself and the murderer also. Why had I not seen this before? Simply because the phenomenon of the double personality had not occurred before in this inquiry.

"Now who of the four persons in the gallery was both that person and the a.s.sa.s.sin? I went over in my mind what I had seen. I had seen at one and the same time, Monsieur Stangerson and the murderer, Daddy Jacques and the murderer, myself and the murderer; so that the murderer, then, could not be either Monsieur Stangerson, Daddy Jacques, or myself. Had I seen Frederic Larsan and the murderer at the same time?-No!-Two seconds had pa.s.sed, during which I lost sight of the murderer; for, as I have noted in my papers, he arrived two seconds before Monsieur Stangerson, Daddy Jacques, and myself at the meeting-point of the two galleries. That would have given Larsan time to go through the 'off-turning' gallery, s.n.a.t.c.h off his false beard, return, and hurry with us as if, like us, in pursuit of the murderer. I was sure now I had got hold of the right end in my reasoning. With Frederic Larsan was now always a.s.sociated, in my mind, the personality of the unknown of whom I was in pursuit-the murderer, in other words.

"That revelation staggered me. I tried to regain my balance by going over the evidences previously traced, but which had diverted my mind and led me away from Frederic Larsan. What were these evidences?

"1st. I had seen the unknown in Mademoiselle Stangerson's chamber. On going to Frederic Larsan's room, I had found Larsan sound asleep.

"2nd. The ladder.

"3rd. I had placed Frederic Larsan at the end of the 'off-turning' gallery and had told him that I would rush into Mademoiselle Stangerson's room to try to capture the murderer. Then I returned to Mademoiselle Stangerson's chamber where I had seen the unknown.

"The first evidence did not disturb me much. It is likely that, when I descended from my ladder, after having seen the unknown in Mademoiselle Stangerson's chamber, Larsan had already finished what he was doing there. Then, while I was re-entering the chateau, Larsan went back to his own room and, undressing himself, went to sleep.

"Nor did the second evidence trouble me. If Larsan were the murderer, he could have no use for a ladder; but the ladder might have been placed there to give an appearance to the murderer's entrance from without the chateau; especially as Larsan had accused Darzac and Darzac was not in the chateau that night. Further, the ladder might have been placed there to facilitate Larsan's flight in case of absolute necessity.

"But the third evidence puzzled me altogether. Having placed Larsan at the end of the 'off-turning gallery,' I could not explain how he had taken advantage of the moment when I had gone to the left wing of the chateau to find Monsieur Stangerson and Daddy Jacques, to return to Mademoiselle Stangerson's room. It was a very dangerous thing to do. He risked being captured,-and he knew it. And he was very nearly captured. He had not had time to regain his post, as he had certainly hoped to do. He had then a very strong reason for returning to his room. As for myself, when I sent Daddy Jacques to the end of the 'right gallery,' I naturally thought that Larsan was still at his post. Daddy Jacques, in going to his post, had not looked, when he pa.s.sed, to see whether Larsan was at his post or not.

"What, then, was the urgent reason which had compelled Larsan to go to the room a second time? I guessed it to be some evidence of his presence there. He had left something very important in that room. What was it? And had he recovered it? I begged Madame Bernier who was accustomed to clean the room to look, and she found a pair of eye-gla.s.ses-this pair, Monsieur President!"

And Rouletabille drew the eye-gla.s.ses, of which we know, from his pocket.

"When I saw these eye-gla.s.ses," he continued, "I was utterly nonplussed. I had never seen Larsan wear eye-gla.s.ses. What did they mean? Suddenly I exclaimed to myself: 'I wonder if he is long-sighted?' I had never seen Larsan write. He might, then, be long-sighted. They would certainly know at the Surete, and also know if the gla.s.ses were his. Such evidence would be d.a.m.ning. That explained Larsan's return. I know now that Larsan, or Ballmeyer, is long-sighted and that these gla.s.ses belonged to him.

"I now made one mistake. I was not satisfied with the evidence I had obtained. I wished to see the man's face. Had I refrained from this, the second terrible attack would not have occurred."

"But," asked the President, "why should Larsan go to Mademoiselle Stangerson's room, at all? Why should he twice attempt to murder her?"

"Because he loves her, Monsieur President."

"That is certainly a reason, but-"

"It is the only reason. He was madly in love, and because of that, and-other things, he was capable of committing any crime."

"Did Mademoiselle Stangerson know this?"

"Yes, Monsieur; but she was ignorant of the fact that the man who was pursuing her was Frederic Larsan, otherwise, of course, he would not have been allowed to be at the chateau. I noticed, when he was in her room after the incident in the gallery, that he kept himself in the shadow, and that he kept his head bent down. He was looking for the lost eye-gla.s.ses. Mademoiselle Stangerson knew Larsan under another name."

"Monsieur Darzac," asked the President, "did Mademoiselle Stangerson in any way confide in you on this matter? How is it that she has never spoken about it to anyone? If you are innocent, she would have wished to spare you the pain of being accused."

"Mademoiselle Stangerson told me nothing," replied Monsieur Darzac.

"Does what this young man says appear probable to you?" the President asked.

"Mademoiselle Stangerson has told me nothing," he replied stolidly.

"How do you explain that, on the night of the murder of the keeper," the President asked, turning to Rouletabille, "the murderer brought back the papers stolen from Monsieur Stangerson?-How do you explain how the murderer gained entrance into Mademoiselle Stangerson's locked room?"

"The last question is easily answered. A man like Larsan, or Ballmeyer, could have had made duplicate keys. As to the doc.u.ments, I think Larsan had not intended to steal them, at first. Closely watching Mademoiselle with the purpose of preventing her marriage with Monsieur Robert Darzac, he one day followed her and Monsieur into the Grands Magasins de la Louvre. There he got possession of the reticule which she lost, or left behind. In that reticule was a key with a bra.s.s head. He did not know there was any value attached to the key till the advertis.e.m.e.nt in the newspapers revealed it. He then wrote to Mademoiselle, as the advertis.e.m.e.nt requested. No doubt he asked for a meeting, making known to her that he was also the person who had for some time pursued her with his love. He received no answer. He went to the Post Office and ascertained that his letter was no longer there. He had already taken complete stock of Monsieur Darzac, and, having decided to go to any lengths to gain Mademoiselle Stangerson, he had planned that, whatever might happen, Monsieur Darzac, his hated rival, should be the man to be suspected.

"I do not think that Larsan had as yet thought of murdering Mademoiselle Stangerson; but whatever he might do, he made sure that Monsieur Darzac should suffer for it. He was very nearly of the same height as Monsieur Darzac and had almost the same sized feet. It would not be difficult, to take an impression of Monsieur Darzac's footprints, and have similar boots made for himself. Such tricks were mere child's play for Larsan, or Ballmeyer.

"Receiving no reply to his letter, he determined, since Mademoiselle Stangerson would not come to him, that he would go to her. His plan had long been formed. He had made himself master of the plans of the chateau and the pavilion. So that, one afternoon, while Monsieur and Mademoiselle Stangerson were out for a walk, and while Daddy Jacques was away, he entered the latter by the vestibule window. He was alone, and, being in no hurry, he began examining the furniture. One of the pieces, resembling a safe, had a very small keyhole. That interested him! He had with him the little key with the bra.s.s head, and, a.s.sociating one with the other, he tried the key in the lock. The door opened. He saw nothing but papers. They must be very valuable to have been put away in a safe, and the key to which to be of so much importance. Perhaps a thought of blackmail occurred to him as a useful possibility in helping him in his designs on Mademoiselle Stangerson. He quickly made a parcel of the papers and took it to the lavatory in the vestibule. Between the time of his first examination of the pavilion and the night of the murder of the keeper, Larsan had had time to find out what those papers contained. He could do nothing with them, and they were rather compromising. That night he took them back to the chateau. Perhaps he hoped that, by returning the papers he might obtain some grat.i.tude from Mademoiselle Stangerson. But whatever may have been his reasons, he took the papers back and so rid himself of an enc.u.mbrance."

Rouletabille coughed. It was evident to me that he was embarra.s.sed. He had arrived at a point where he had to keep back his knowledge of Larsan's true motive. The explanation he had given had evidently been unsatisfactory. Rouletabille was quick enough to note the bad impression he had made, for, turning to the President, he said: "And now we come to the explanation of the Mystery of The Yellow Room!"

A movement of chairs in the court with a rustling of dresses and an energetic whispering of "Hush!" showed the curiosity that had been aroused.

"It seems to me," said the President, "that the Mystery of The Yellow Room, Monsieur Rouletabille, is wholly explained by your hypothesis. Frederic Larsan is the explanation. We have merely to subst.i.tute him for Monsieur Robert Darzac. Evidently the door of The Yellow Room was open at the time Monsieur Stangerson was alone, and that he allowed the man who was coming out of his daughter's chamber to pa.s.s without arresting him-perhaps at her entreaty to avoid all scandal."

"No, Monsieur President," protested the young man. "You forget that, stunned by the attack made on her, Mademoiselle Stangerson was not in a condition to have made such an appeal. Nor could she have locked and bolted herself in her room. You must also remember that Monsieur Stangerson has sworn that the door was not open."

"That, however, is the only way in which it can be explained. The Yellow Room was as closely shut as an iron safe. To use your own expression, it was impossible for the murderer to make his escape either naturally or supernaturally. When the room was broken into he was not there! He must, therefore, have escaped."

"That does not follow."

"What do you mean?"

"There was no need for him to escape-if he was not there!"

"Not there!"

"Evidently, not. He could not have been there, if he were not found there."

"But, what about the evidences of his presence?" asked the President.

"That, Monsieur President, is where we have taken hold of the wrong end. From the time Mademoiselle Stangerson shut herself in the room to the time her door was burst open, it was impossible for the murderer to escape. He was not found because he was not there during that time."

"But the evidences?"

"They have led us astray. In reasoning on this mystery we must not take them to mean what they apparently mean. Why do we conclude the murderer was there?-Because he left his tracks in the room? Good! But may he not have been there before the room was locked. Nay, he must have been there before! Let us look into the matter of these traces and see if they do not point to my conclusion.

"After the publication of the article in the 'Matin' and my conversation with the examining magistrate on the journey from Paris to Epinaysur-Orge, I was certain that The Yellow Room had been hermetically sealed, so to speak, and that consequently the murderer had escaped before Mademoiselle Stangerson had gone into her chamber at midnight.

"At the time I was much puzzled. Mademoiselle Stangerson could not have been her own murderer, since the evidences pointed to some other person. The a.s.sa.s.sin, then, had come before. If that were so, how was it that Mademoiselle had been attacked after? or rather, that she appeared to have been attacked after? It was necessary for me to reconstruct the occurrence and make of it two phases-each separated from the other, in time, by the s.p.a.ce of several hours. One phase in which Mademoiselle Stangerson had really been attacked-the other phase in which those who heard her cries thought she was being attacked. I had not then examined The Yellow Room. What were the marks on Mademoiselle Stangerson? There were marks of strangulation and the wound from a hard blow on the temple. The marks of strangulation did not interest me much; they might have been made before, and Mademoiselle Stangerson could have concealed them by a collarette, or any similar article of apparel. I had to suppose this the moment I was compelled to reconstruct the occurrence by two phases. Mademoiselle Stangerson had, no doubt, her own reasons for so doing, since she had told her father nothing of it, and had made it understood to the examining magistrate that the attack had taken place in the night, during the second phase. She was forced to say that, otherwise her father would have questioned her as to her reason for having said nothing about it.

"But I could not explain the blow on the temple. I understood it even less when I learned that the mutton-bone had been found in her room. She could not hide the fact that she had been struck on the head, and yet that wound appeared evidently to have been inflicted during the first phase, since it required the presence of the murderer! I thought Mademoiselle Stangerson had hidden the wound by arranging her hair in bands on her forehead.

"As to the mark of the hand on the wall, that had evidently been made during the first phase-when the murderer was really there. All the traces of his presence had naturally been left during the first phase; the mutton-bone, the black footprints, the Basque cap, the handkerchief, the blood on the wall, on the door, and on the floor. If those traces were still all there, they showed that Mademoiselle Stangerson-who desired that nothing should be known-had not yet had time to clear them away. This led me to the conclusion that the two phases had taken place one shortly after the other. She had not had the opportunity, after leaving her room and going back to the laboratory to her father, to get back again to her room and put it in order. Her father was all the time with her, working. So that after the first phase she did not re-enter her chamber till midnight. Daddy Jacques was there at ten o'clock, as he was every night; but he went in merely to close the blinds and light the night-light. Owing to her disturbed state of mind she had forgotten that Daddy Jacques would go into her room and had begged him not to trouble himself. All this was set forth in the article in the 'Matin.' Daddy Jacques did go, however, and, in the dim light of the room, saw nothing.

"Mademoiselle Stangerson must have lived some anxious moments while Daddy Jacques was absent; but I think she was not aware that so many evidences had been left. After she had been attacked she had only time to hide the traces of the man's fingers on her neck and to hurry to the laboratory. Had she known of the bone, the cap, and the handkerchief, she would have made away with them after she had gone back to her chamber at midnight. She did not see them, and undressed by the uncertain glimmer of the night light. She went to bed, worn-out by anxiety and fear-a fear that had made her remain in the laboratory as late as possible.

"My reasoning had thus brought me to the second phase of the tragedy, when Mademoiselle Stangerson was alone in the room. I had now to explain the revolver shots fired during the second phase. Cries of 'Help!-Murder!' had been heard. How to explain these? As to the cries, I was in no difficulty; since she was alone in her room these could result from nightmare only. My explanation of the struggle and noise that were heard is simply that in her nightmare she was haunted by the terrible experience she had pa.s.sed through in the afternoon. In her dream she sees the murderer about to spring upon her and she cries, 'Help! Murder!' Her hand wildly seeks the revolver she had placed within her reach on the night-table by the side of her bed, but her hand, striking the table, overturns it, and the revolver, falling to the floor, discharges itself, the bullet lodging in the ceiling. I knew from the first that the bullet in the ceiling must have resulted from an accident. Its very position suggested an accident to my mind, and so fell in with my theory of a nightmare. I no longer doubted that the attack had taken place before Mademoiselle had retired for the night. After wakening from her frightful dream and crying aloud for help, she had fainted.

"My theory, based on the evidence of the shots that were heard at midnight, demanded two shots-one which wounded the murderer at the time of his attack, and one fired at the time of the nightmare. The evidence given by the Berniers before the examining magistrate was to the effect that only one shot had been heard. Monsieur Stangerson testified to hearing a dull sound first followed by a sharp ringing sound. The dull sound I explained by the falling of the marble-topped table; the ringing sound was the shot from the revolver. I was now convinced I was right. The shot that had wounded the hand of the murderer and had caused it to bleed so that he left the b.l.o.o.d.y imprint on the wall was fired by Mademoiselle in self-defence, before the second phase, when she had been really attacked. The shot in the ceiling which the Berniers heard was the accidental shot during the nightmare.

"I had now to explain the wound on the temple. It was not severe enough to have been made by means of the mutton-bone, and Mademoiselle had not attempted to hide it. It must have been made during the second phase. It was to find this out that I went to The Yellow Room, and I obtained my answer there."