fiance.  The marks made by the bicycle may have been made by his
   bicycle.  He had usually left it at the chateau; why did he take
   it to Paris on that particular occasion?  Was it because he was
   not going to return again to the chateau?  Was it because, owing
   to the breaking off of his marriage, his relations with the
   Stangersons were to cease?  All who are interested in the matter
   affirm that those relations were to continue unchanged.
   "Frederic Larsan, however, believes that all relations were at an
   end.  From the day when Monsieur Darzac accompanied Mademoiselle
   Stangerson to the Grands Magasins de la Louvre until the day after
   the crime, he had not been at the Glandier.  Remember that
   Mademoiselle Stangerson lost her reticule containing the key with
   the brass head while she was in his company.  From that day to the
   evening at the Elysee, the Sorbonne professor and Mademoiselle
   Stangerson did not see one another; but they may have written to
   each other.  Mademoiselle Stangerson went to the Post Office to
   get a letter, which Larsan says was written by Robert Darzac; for
   knowing nothing of what had passed at the Elysee, Larsan believes
   that it was Monsieur Darzac himself who stole the reticule with
   the key, with the design of forcing her consent, by getting
   possession of the precious papers of her father--papers which
   he would have restored to him on condition that the marriage
   engagement was to be fulfilled.
   "All that would have been a very doubtful and almost absurd
   hypothesis, as Larsan admitted to me, but for another and much
   graver circumstance.  In the first place here is something which I
   have not been able to explain--Monsieur Darzac had himself, on the
   24th, gone to the Post Office to ask for the letter which
   Mademoiselle had called for and received on the previous evening.
   The description of the man who made application tallies in every
   respect with the appearance of Monsieur Darzac, who, in answer to
   the questions put to him by the examining magistrate, denies that
   he went to the Post Office.  Now even admitting that the letter was
   written by him--which I do not believe--he knew that Mademoiselle
   Stangerson had received it, since he had seen it in her hands in
   the garden at the Elysee.  It could not have been he, then, who
   had gone to the Post Office, the day after the 24th, to ask for a
   letter which he knew was no longer there.
   "To me it appears clear that somebody, strongly resembling him,
   stole Mademoiselle Stangerson's reticule and in that letter, had
   demanded of her something which she had not sent him.  He must have
   been surprised at the failure of his demand, hence his application
   at the Post Office, to learn whether his letter had been delivered
   to the person to whom it had been addressed.  Finding that it had
   been claimed, he had become furious.  What had he demanded?  Nobody
   but Mademoiselle Stangerson knows.  Then, on the day following, it
   is reported that she had been attacked during the night, and, the
   next day, I discovered that the Professor had, at the same time,
   been robbed by means of the key referred to in the poste restante
   letter.  It would seem, then, that the man who went to the Post
   Office to inquire for the letter must have been the murderer.  All
   these arguments Larsan applies as against Monsieur Darzac.  You
   may be sure that the examining magistrate, Larsan, and myself, have
   done our best to get from the Post Office precise details relative
   to the singular personage who applied there on the 24th of October.
   But nothing has been learned.  We don't know where he came from--or
   where he went.  Beyond the description which makes him resemble
   Monsieur Darzac, we know nothing.
   "I have announced in the leading journals that a handsome reward
   will be given to a driver of any public conveyance who drove a fare
   to No. 40, Post Office, about ten o'clock on the morning of the 24th
   of October.  Information to be addressed to 'M. R.,' at the office
   of the 'Epoque'; but no answer has resulted.  The man may have
   walked; but, as he was most likely in a hurry, there was a chance
   that he might have gone in a cab.  Who, I keep asking myself night
   and day, is the man who so strongly resembles Monsieur Robert Darzac,
   and who is also known to have bought the cane which has fallen into
   Larsan's hands?
   "The most serious fact is that Monsieur Darzac was, at the very same
   time that his double presented himself at the Post Office, scheduled
   for a lecture at the Sorbonne.  He had not delivered that lecture,
   and one of his friends took his place.  When I questioned him as to
   how he had employed the time, he told me that he had gone for a
   stroll in the Bois de Boulogne.  What do you think of a professor
   who, instead of giving his lecture, obtains a substitute to go for
   a stroll in the Bois de Boulogne?  When Frederic Larsan asked him
   for information on this point, he quietly replied that it was no
   business of his how he spent his time in Paris.  On which Fred swore
   aloud that he would find out, without anybody's help.
   "All this seems to fit in with Fred's hypothesis, namely, that
   Monsieur Stangerson allowed the murderer to escape in order to avoid
   a scandal.  The hypothesis is further substantiated by the fact that
   Darzac was in The Yellow Room and was permitted to get away.  That
   hypothesis I believe to be a false one.--Larsan is being misled by
   it, though that would not displease me, did it not affect an innocent
   person.  Now does that hypothesis really mislead Frederic Larsan?
   That is the question--that is the question."
   "Perhaps he is right," I cried, interrupting Rouletabille.  "Are
   you sure that Monsieur Darzac is innocent?--It seems to me that
   these are extraordinary coincidences--"
   "Coincidences," replied my friend, "are the worst enemies to truth."
   "What does the examining magistrate think now of the matter?"
   "Monsieur de Marquet hesitates to accuse Monsieur Darzac, in the
   absence of absolute proofs.  Not only would he have public opinion
   wholly against him, to say nothing of the Sorbonne, but Monsieur
   and Mademoiselle Stangerson.  She adores Monsieur Robert Darzac.
   Indistinctly as she saw the murderer, it would be hard to make the
   public believe that she could not have recognised him, if Darzac
   had been the criminal.  No doubt The Yellow Room was very dimly
   lit; but a night-light, however small, gives some light.  Here, my
   boy, is how things stood when, three days, or rather three nights
   ago, an extraordinarily strange incident occurred."
   CHAPTER XIV
   "I Expect the Assassin This Evening"
   "I must take you," said Rouletabille, "so as to enable you to
   understand, to the various scenes.  I myself believe that I have
   discovered what everybody else is searching for, namely, how the
   murderer escaped from The Yellow Room, without any accomplice, and
   without Mademoiselle Stangerson having had anything to do with it.
   But so long as I am not sure of the real murderer, I cannot state
 
					     					 			   the theory on which I am working.  I can only say that I believe
   it to be correct and, in any case, a quite natural and simple one.
   As to what happened in this place three nights ago, I must say it
   kept me wondering for a whole day and a night.  It passes all belief.
   The theory I have formed from the incident is so absurd that I would
   rather matters remained as yet unexplained."
   Saying which the young reporter invited me to go and make the tour
   of the chateau with him.  The only sound to be heard was the
   crunching of the dead leaves beneath our feet.  The silence was so
   intense that one might have thought the chateau had been abandoned.
   The old stones, the stagnant water of the ditch surrounding the
   donjon, the bleak ground strewn with the dead leaves, the dark,
   skeleton-like outlines of the trees, all contributed to give to the
   desolate place, now filled with its awful mystery, a most funereal
   aspect.  As we passed round the donjon, we met the Green Man, the
   forest-keeper, who did not greet us, but walked by as if we had not
   existed.  He was looking just as I had formerly seen him through
   the window of the Donjon Inn.  He had still his fowling-piece slung
   at his back, his pipe was in his mouth, and his eye-glasses on his
   nose.
   "An odd kind of fish!" Rouletabille said to me, in a low tone.
   "Have you spoken to him?" I asked.
   "Yes, but I could get nothing out of him.  His only answers are
   grunts and shrugs of the shoulders.  He generally lives on the
   first floor of the donjon, a big room that once served for an
   oratory.  He lives like a bear, never goes out without his gun,
   and is only pleasant with the girls.  The women, for twelve miles
   round, are all setting their caps for him.  For the present, he is
   paying attention to Madame Mathieu, whose husband is keeping a
   lynx eye upon her in consequence."
   After passing the donjon, which is situated at the extreme end of
   the left wing, we went to the back of the chateau.  Rouletabille,
   pointing to a window which I recognised as the only one belonging
   to Mademoiselle Stangerson's apartment, said to me:
   "If you had been here, two nights ago, you would have seen your
   humble servant at the top of a ladder, about to enter the chateau
   by that window."
   As I expressed some surprise at this piece of nocturnal gymnastics,
   he begged me to notice carefully the exterior disposition of the
   chateau.  We then went back into the building.
   "I must now show you the first floor of the chateau, where I am
   living," said my friend.
   To enable the reader the better to understand the disposition of
   these parts of the dwelling, I annex a plan of the first floor of
   the right wing, drawn by Rouletabille the day after the
   extraordinary phenomenon occurred, the details of which I am about
   to relate.
   ***
                          boudoir
   ___ ____ ___________ __________ ________4________ _______ _________ __
   |             |            |   |             |           |
   |             |  Mlle.     |   |    Mlle.    |___ ___ ___|    Mr.
      Lumber     |Strangerson's    Strangerson's|___ ___ ___|Strangerson's
   |   Room      | Sitting    |   |   Bed Room  |___ ___ ___|   Room
   |             |  Room      |   |__  __  _____|stair-case |
                 |            |   |bath|anteroom|           |
   |_____  ______|____  ______|___|____|___  ___|           |______  _____
   |
    2 ------ Right Gallery  Right Wing--------- 3            Right Gallery
                                                              Left Wing
   |_________    _____ _________ ______ _______ __ __   __ _________ _____
   |Roulet-   | W G |
   |tabille's | I A |        Right Wing                         Left Wing
   | Room       N L           of the
   |_________ | D L |         Chateau
    Frederic  | I E |
   |Larsan's    N R
   |  Room    | G Y |
              |     |
   |____ ____ | _1_ |
    .           5  .
     .     6      .
      .         .
        .  .  .
   ***
   Rouletabille motioned me to follow him up a magnificent flight of
   stairs ending in a landing on the first floor.  From this landing
   one could pass to the right or left wing of the chateau by a gallery
   opening from it.  This gallery, high and wide, extended along the
   whole length of the building and was lit from the front of the
   chateau facing the north.  The rooms, the windows of which looked
   to the south, opened out of the gallery.  Professor Stangerson
   inhabited the left wing of the building.  Mademoiselle Stangerson
   had her apartment in the right wing.
   We entered the gallery to the right.  A narrow carpet, laid on the
   waxed oaken floor, which shone like glass, deadened the sound of our
   footsteps.  Rouletabille asked me, in a low tone, to walk carefully,
   as we were passing the door of Mademoiselle Stangerson's apartment.
   This consisted of a bed-room, an ante-room, a small bath-room, a
   boudoir, and a drawing-room.  One could pass from one to another of
   these rooms without having to go by way of the gallery.  The gallery
   continued straight to the western end of the building, where it was
   lit by a high window (window 2 on the plan).  At about two-thirds of
   its length this gallery, at a right angle, joined another gallery
   following the course of the right wing.
   The better to follow this narrative, we shall call the gallery
   leading from the stairs to the eastern window, the "right" gallery
   and the gallery quitting it at a right angle, the "off-turning"
   gallery (winding gallery in the plan).  It was at the meeting point
   of the two galleries that Rouletabille had his chamber, adjoining
   that of Frederic Larsan, the door of each opening on to the
   "off-turning" gallery, while the doors of Mademoiselle Stangerson's
   apartment opened into the "right" gallery.  (See the plan.)
   Rouletabille opened the door of his room and after we had passed
   in, carefully drew the bolt.  I had not had time to glance round
   the place in which he had been installed, when he uttered a cry of
   surprise and pointed to a pair of eye-glasses on a side-table.
   "What are these doing here?" he asked.
   I should have been puzzled to answer him.
   "I wonder," he said, "I wonder if this is what I have been searching
   for.  I wonder if these are the eye-glasses from the presbytery!"
   He seized them eagerly, his fingers caressing the glass.  Then
   looking at me, with an expression of terror on his face, he murmured,
   "Oh!--Oh!"
   He repeated the exclamation again and again, as if his thoughts had
   suddenly turned his brain.
   He rose and, putting his hand on my shoulder, laughed like one
   demented as he said:
   "Those glasses will drive me silly!  Mathematically speaking the
   thing is possible; but humanly speaking it is impossible--or
   afterwards--or afterwards--"
   Two light knocks struck the door.  Rouletabille opened it.  A figure
    
					     					 			entered.  I recognised the concierge, whom I had seen when she was
   being taken to the pavilion for examination.  I was surprised,
   thinking she was still under lock and key.  This woman said in a
   very low tone:
   "In the grove of the parquet."
   Rouletabille replied: "Thanks."--The woman then left.  He again
   turned to me, his look haggard, after having carefully refastened
   the door, muttering some incomprehensible phrases.
   "If the thing is mathematically possible, why should it not be 
   humanly!--And if it is humanly possible, the matter is simply awful."
   I interrupted him in his soliloquy:
   "Have they set the concierges at liberty, then?" I asked.
   "Yes," he replied, "I had them liberated, I needed people I could
   trust.  The woman is thoroughly devoted to me, and her husband would
   lay down his life for me."
   "Oho!" I said, "when will he have occasion to do it?"
   "This evening,--for this evening I expect the murderer."
   "You expect the murderer this evening?  Then you know him?"
   "I shall know him; but I should be mad to affirm, categorically, at
   this moment that I do know him.  The mathematical idea I have of the
   murderer gives results so frightful, so monstrous, that I hope it is
   still possible that I am mistaken.  I hope so, with all my heart!"
   "Five minutes ago, you did not know the murderer; how can you say
   that you expect him this evening?"
   "Because I know that he must come."
   Rouletabille very slowly filled his pipe and lit it.  That meant an
   interesting story.  At that moment we heard some one walking in the
   gallery and passing before our door.  Rouletabille listened.  The
   sound of the footstep died away in the distance.
   "Is Frederic Larsan in his room?" I asked, pointing to the partition.
   "No," my friend answered.  "He went to Paris this morning,--still
   on the scent of Darzac, who also left for Paris.  That matter will
   turn out badly.  I expect that Monsieur Darzac will be arrested in
   the course of the next week.  The worst of it is that everything
   seems to be in league against him,--circumstances, things, people.
   Not an hour passes without bringing some new evidence against him.
   The examining magistrate is overwhelmed by it--and blind."
   "Frederic Larsan, however, is not a novice," I said.
   "I thought so," said Rouletabille, with a slightly contemptuous turn
   of his lips, "I fancied he was a much abler man.  I had, indeed, a
   great admiration for him, before I got to know his method of working.
   It's deplorable.  He owes his reputation solely to his ability; but
   he lacks reasoning power,--the mathematics of his ideas are very
   poor."
   I looked closely at Rouletabille and could not help smiling, on
   hearing this boy of eighteen talking of a man who had proved to
   the world that he was the finest police sleuth in Europe.
   "You smile," he said?  "you are wrong!  I swear I will outwit him
   --and in a striking way!  But I must make haste about it, for he has
   an enormous start on me--given him by Monsieur Robert Darzac, who
   is this evening going to increase it still more.  Think of it!
   --every time the murderer comes to the chateau, Monsieur Darzac, by
   a strange fatality, absents himself and refuses to give any account
   of how he employs his time."
   "Every time the assassin comes to the chateau!" I cried.  "Has he
   returned then--?"
   "Yes, during that famous night when the strange phenomenon occurred."
   I was now going to learn about the astonishing phenomenon to which
   Rouletabille had made allusion half an hour earlier without giving
   me any explanation of it.  But I had learned never to press
   Rouletabille in his narratives.  He spoke when the fancy took him
   and when he judged it to be right.  He was less concerned about my
   curiosity than he was for making a complete summing up for himself
   of any important matter in which he was interested.