trying vainly to link together the different events of the day.
   What was in Rouletabille's mind?  Was it possible that he thought
   Monsieur Robert Darzac to be the murderer?  How could it be
   thought that this man, who was to have married Mademoiselle
   Stangerson in the course of a few days, had introduced himself
   into The Yellow Room to assassinate his fiancee?  I could find no
   explanation as to how the murderer had been able to leave The Yellow
   Room; and so long as that mystery, which appeared to me so
   inexplicable, remained unexplained, I thought it was the duty of
   all of us to refrain from suspecting anybody.  But, then, that
   seemingly senseless phrase--"The presbytery has lost nothing of its
   charm, nor the garden its brightness"--still rang in my ears.  What
   did it mean?  I was eager to rejoin Rouletabille and question him.
   At that moment the young man came out of the chateau in the company
   of Monsieur Robert Darzac, and, extraordinary to relate, I saw, at
   a glance, that they were the best of friends.  "We are going to The
   Yellow Room.  Come with us," Rouletabille said to me.  "You know,
   my dear boy, I am going to keep you with me all day.  We'll breakfast
   together somewhere about here--"
   "You'll breakfast with me, here, gentlemen--"
   "No, thanks," replied the young man.  "We shall breakfast at the
   Donjon Inn."
   "You'll fare very badly there; you'll not find anything--"
   "Do you think so?  Well, I hope to find something there," replied
   Rouletabille.  "After breakfast, we'll set to work again.  I'll
   write my article and if you'll be so good as to take it to the
   office for me--"
   "Won't you come back with me to Paris?"
   "No; I shall remain here."
   I turned towards Rouletabille.  He spoke quite seriously, and
   Monsieur Robert Darzac did not appear to be in the least degree
   surprised.
   We were passing by the donjon and heard wailing voices.  Rouletabille
   asked:
   "Why have these people been arrested?"
   "It is a little my fault," said Monsieur Darzac.  "I happened to
   remark to the examining magistrate yesterday that it was inexplicable
   that the concierges had had time to hear the revolver shots, to dress
   themselves, and to cover so great a distance as that which lies
   between their lodge and the pavilion, in the space of two minutes;
   for not more than that interval of time had elapsed after the firing
   of the shots when they were met by Daddy Jacques."
   "That was suspicious evidently," acquiesced Rouletabille.  "And
   were they dressed?"
   "That is what is so incredible--they were dressed--completely
   --not one part of their costume wanting.  The woman wore sabots,
   but the man had on laced boots.  Now they assert that they went to
   bed at half-past nine.  On arriving this morning, the examining
   magistrate brought with him from Paris a revolver of the same calibre
   as that found in the room (for he couldn't use the one held for
   evidence), and made his Registrar fire two shots in The Yellow Room
   while the doors and windows were closed.  We were with him in the
   lodge of the concierges, and yet we heard nothing, not a sound.
   The concierges have lied, of that there can be no doubt.  They must
   have been already waiting, not far from the pavilion, waiting for
   something!  Certainly they are not to be accused of being the authors
   of the crime, but their complicity is not improbable.  That was why
   Monsieur de Marquet had them arrested at once."
   "If they had been accomplices," said Rouletabille, "they would not
   have been there at all.  When people throw themselves into the arms
   of justice with the proofs of complicity on them, you can be sure
   they are not accomplices.  I don't believe there are any accomplices
   in this affair."
   "Then, why were they abroad at midnight?  Why don't they say?"
   "They have certainly some reason for their silence.  What that
   reason is, has to be found out; for, even if they are not
   accomplices, it may be of importance.  Everything that took place
   on such a night is important."
   We had crossed an old bridge thrown over the Douve and were entering
   the part of the park called the Oak Grove, The oaks here were
   centuries old.  Autumn had already shrivelled their tawny leaves,
   and their high branches, black and contorted, looked like horrid
   heads of hair, mingled with quaint reptiles such as the ancient
   sculptors have made on the head of Medusa.  This place, which
   Mademoiselle found cheerful and in which she lived in the summer
   season, appeared to us as sad and funereal now.  The soil was black
   and muddy from the recent rains and the rotting of the fallen
   leaves; the trunks of the trees were black and the sky above us
   was now, as if in mourning, charged with great, heavy clouds.
   And it was in this sombre and desolate retreat that we saw the
   white walls of the pavilion as we approached.  A queer-looking
   building without a window visible on the side by which we neared
   it.  A little door alone marked the entrance to it.  It might
   have passed for a tomb, a vast mausoleum in the midst of a thick
   forest.  As we came nearer, we were able to make out its
   disposition.  The building obtained all the light it needed from
   the south, that is to say, from the open country.  The little door
   closed on the park.  Monsieur and Mademoiselle Stangerson must
   have found it an ideal seclusion for their work and their dreams.
   ___________________________________________________
                        ditch                         |
   ________________________________________________   |
    enclosing wall      ||            ||           |  |
                        ||            ||           |  |
                        ||___   1                  |d |
                        ||bed|        ||           |i |
         PARK           ||___|________||           |t |
                        ||:::::|  4   ||           |c |
                        ||::5::|      ||    2      |h |
   oo  oo               ||:: ::|___  _||           |  |
   Traces   oo          ||            ||           |  |
            of  oo oo oo                           |  |
               Footsteps||            ||           |  |
                        ||            ||           |  |
                        ||   3        ||___________|  |______________
                        ||            ||    6      |      ditch
                        ||____    ____||___________|_________________
                              door                    enclosing wall
   Here is the ground plan of the pavilion.  It had a ground-floor
   which was reached by a few steps, and above it was an attic, with
   which we need not concern ourselves.  The plan of the ground-floor
   only, sketched roughly, is what I here submit to the reader.
   1. The Yellow Room, with its one window and its one door opening
      into the laboratory.
   2. Laboratory, with its two large, barred windows and its doors,
      one serving for the vestibule, the other for The Yellow Roo 
					     					 			m.
   3. Vestibule, with its unbarred window and door opening into the
      park.
   4. Lavatory.
   5. Stairs leading to the attic.
   6. Large and the only chimney in the pavilion, serving for the
       experiments of the laboratory.
   The plan was drawn by Rouletabille, and I assured myself that there
   was not a line in it that was wanting to help to the solution of
   the problem then set before the police.  With the lines of this
   plan and the description of its parts before them, my readers will
   know as much as Rouletabille knew when he entered the pavilion for
   the first time.  With him they may now ask: How did the murderer
   escape from The Yellow Room?  Before mounting the three steps
   leading up to the door of the pavilion, Rouletabille stopped and
   asked Monsieur Darzac point blank:
   "What was the motive for the crime?"
   "Speaking for myself, Monsieur, there can be no doubt on the
   matter," said Mademoiselle Stangerson's fiance, greatly distressed.
   "The nails of the fingers, the deep scratches on the chest and throat
   of Mademoiselle Stangerson show that the wretch who attacked her
   attempted to commit a frightful crime.  The medical experts who
   examined these traces yesterday affirm that they were made by the
   same hand as that which left its red imprint on the wall; an enormous
   hand, Monsieur, much too large to go into my gloves," he added with
   an indefinable smile.
   "Could not that blood-stained hand," I interrupted, "have been the
   hand of Mademoiselle Stangerson who, in the moment of falling, had
   pressed it against the wall, and, in slipping, enlarged the
   impression?"
   "There was not a drop of blood on either of her hands when she was
   lifted up," replied Monsieur Darzac.
   "We are now sure," said I, "that it was Mademoiselle Stangerson
   who was armed with Daddy Jacques's revolver, since she wounded the
   hand of the murderer.  She was in fear, then, of somebody or
   something."
   "Probably."
   "Do you suspect anybody?"
   "No," replied Monsieur Darzac, looking at Rouletabille.  Rouletabille
   then said to me:
   "You must know, my friend, that the inquiry is a little more advanced
   than Monsieur de Marquet has chosen to tell us.  He not only knows
   that Mademoiselle Stangerson defended herself with the revolver,
   but he knows what the weapon was that was used to attack her.
   Monsieur Darzac tells me it was a mutton-bone.  Why is Monsieur de
   Marquet surrounding this mutton-bone with so much mystery?  No doubt
   for the purpose of facilitating the inquiries of the agents of the
   Surete?  He imagines, perhaps, that the owner of this instrument of
   crime, the most terrible invented, is going to be found amongst those
   who are well-known in the slums of Paris who use it.  But who can
   ever say what passes through the brain of an examining magistrate?"
   Rouletabille added with contemptuous irony.
   "Has a mutton-bone been found in The Yellow Room?" I asked him.
   "Yes, Monsieur," said Robert Darzac, "at the foot of the bed; but I
   beg of you not to say anything about it."  (I made a gesture of
   assent.) "It was an enormous mutton-bone, the top of which, or
   rather the joint, was still red with the blood of the frightful
   wound.  It was an old bone, which may, according to appearances,
   have served in other crimes.  That's what Monsieur de Marquet
   thinks.  He has had it sent to the municipal laboratory at Paris to
   be analysed.  In fact, he thinks he has detected on it, not only
   the blood of the last victim, but other stains of dried blood,
   evidences of previous crimes."
   "A mutton-bone in the hand of a skilled assassin is a frightful
   weapon," said Rouletabille, "a more certain weapon than a heavy
   hammer."
   "The scoundrel has proved it to be so," said Monsieur Robert
   Darzac, sadly.  "The joint of the bone found exactly fits the
   wound inflicted.
   "My belief is that the wound would have been mortal, if the murderer's
   blow had not been arrested in the act by Mademoiselle Stangerson's
   revolver.  Wounded in the hand, he dropped the mutton-bone and fled.
   Unfortunately, the blow had been already given, and Mademoiselle was
   stunned after having been nearly strangled.  If she had succeeded in
   wounding the man with the first shot of the revolver, she would,
   doubtless, have escaped the blow with the bone.  But she had
   certainly employed her revolver too late; the first shot deviated and
   lodged in the ceiling; it was the second only that took effect."
   Having said this, Monsieur Darzac knocked at the door of the pavilion.
   I must confess to feeling a strong impatience to reach the spot where
   the crime had been committed.  It was some time before the door was
   opened by a man whom I at once recognised as Daddy Jacques.
   He appeared to be well over sixty years of age.  He had a long white
   beard and white hair, on which he wore a flat Basque cap.  He was
   dressed in a complete suit of chestnut-coloured velveteen, worn at
   the sides; sabots were on his feet.  He had rather a waspish-looking
   face, the expression of which lightened, however, as soon as he saw
   Monsieur Darzac.
   "Friends," said our guide.  "Nobody in the pavilion, Daddy Jacques?"
   "I ought not to allow anybody to enter, Monsieur Robert, but of
   course the order does not apply to you.  These gentlemen of justice
   have seen everything there is to be seen, and made enough drawings,
   and drawn up enough reports--"
   "Excuse me, Monsieur Jacques, one question before anything else,"
   said Rouletabille.
   "What is it, young man?  If I can answer it--"
   "Did your mistress wear her hair in bands, that evening?  You know
   what I mean--over her forehead?"
   "No, young man.  My mistress never wore her hair in the way you
   suggest, neither on that day nor on any other.  She had her hair
   drawn up, as usual, so that her beautiful forehead could be seen,
   pure as that of an unborn child!"
   Rouletabille grunted and set to work examining the door, finding
   that it fastened itself automatically.  He satisfied himself that
   it could never remain open and needed a key to open it.  Then we
   entered the vestibule, a small, well-lit room paved with square
   red tiles.
   "Ah!  This is the window by which the murderer escaped!" said
   Rouletabille.
   "So they keep on saying, monsieur, so they keep on saying!  But if
   he had gone off that way, we should have been sure to have seen him.
   We are not blind, neither Monsieur Stangerson nor me, nor the
   concierges who are in prison.  Why have they not put me in prison,
   too, on account of my revolver?"
   Rouletabille had already opened the window and was examining the
   shutters.
   "Were these closed at the time of the crime?"
   "And fastened with the iron catch inside," said Daddy Jacques, "and
   I am quite sure that the murderer did not get out that way."
   "Are there any blood stains?"
   "Yes, on the stones outside; but blood of what?"
					     					 			 />   "Ah!" said Rouletabille, "there are footmarks visible on the path
   --the ground was very moist.  I will look into that presently."
   "Nonsense!" interrupted Daddy Jacques; "the murderer did not go
   that way."
   "Which way did he go, then?"
   "How do I know?"
   Rouletabille looked at everything, smelled everything.  He went down
   on his knees and rapidly examined every one of the paving tiles.
   Daddy Jacques went on:
   "Ah!--you can't find anything, monsieur.  Nothing has been found.
   And now it is all dirty; too many persons have tramped over it.
   They wouldn't let me wash it, but on the day of the crime I had
   washed the floor thoroughly, and if the murderer had crossed it with
   his hobnailed boots, I should not have failed to see where he had
   been; he has left marks enough in Mademoiselle's chamber."
   Rouletabille rose.
   "When was the last time you washed these tiles?" he asked, and he
   fixed on Daddy Jacques a most searching look.
   "Why--as I told you--on the day of the crime, towards half-past
   five--while Mademoiselle and her father were taking a little walk
   before dinner, here in this room: they had dined in the laboratory.
   The next day, the examining magistrate came and saw all the marks
   there were on the floor as plainly as if they had been made with
   ink on white paper.  Well, neither in the laboratory nor in the
   vestibule, which were both as clean as a new pin, were there any
   traces of a man's footmarks.  Since they have been found near this
   window outside, he must have made his way through the ceiling of
   The Yellow Room into the attic, then cut his way through the roof
   and dropped to the ground outside the vestibule window.  But
   --there's no hole, neither in the ceiling of The Yellow Room nor
   in the roof of my attic--that's absolutely certain!  So you see
   we know nothing--nothing!  And nothing will ever be known!  It's
   a mystery of the Devil's own making."
   Rouletabille went down upon his knees again almost in front of a
   small lavatory at the back of the vestibule.  In that position he
   remained for about a minute.
   "Well?" I asked him when he got up.
   "Oh!  nothing very important,--a drop of blood," he replied,
   turning towards Daddy Jacques as he spoke.  "While you were washing
   the laboratory and this vestibule, was the vestibule window open?"
   he asked.
   "No, Monsieur, it was closed; but after I had done washing the floor,
   I lit some charcoal for Monsieur in the laboratory furnace, and, as
   I lit it with old newspapers, it smoked, so I opened both the windows
   in the laboratory and this one, to make a current of air; then I shut
   those in the laboratory and left this one open when I went out.  When
   I returned to the pavilion, this window had been closed and Monsieur
   and Mademoiselle were already at work in the laboratory."
   "Monsieur or Mademoiselle Stangerson had, no doubt, shut it?"
   "No doubt."
   "You did not ask them?"
   After a close scrutiny of the little lavatory and of the staircase
   leading up to the attic, Rouletabille--to whom we seemed no longer
   to exist--entered the laboratory.  I followed him.  It was, I
   confess, in a state of great excitement.  Robert Darzac lost none
   of my friend's movements.  As for me, my eyes were drawn at once to
   the door of The Yellow Room.  It was closed and, as I immediately
   saw, partially shattered and out of commission.
   My friend, who went about his work methodically, silently studied
   the room in which we were.  It was large and well-lighted.  Two
   big windows--almost bays--were protected by strong iron bars and
   looked out upon a wide extent of country.  Through an opening in
   the forest, they commanded a wonderful view through the length of
   the valley and across the plain to the large town which could be
   clearly seen in fair weather.  To-day, however, a mist hung over
   the ground--and blood in that room!