<h2><SPAN name="CHAPTER_XIII" id="CHAPTER_XIII"></SPAN>CHAPTER XIII</h2>
<p>Duvall, upon discovering that the address of Miss Marcia Ford was on
West 57th Street, but two doors from the building in which the Morton
apartment was located, began to feel that he was on the right track. He
had known, ever since his first day upon the case, that the mysterious
messages found in Ruth Morton's bedroom had been placed there by some
ingenious but perfectly natural means. The apparition that had so
startled the girl upon her last night at the flat was capable, of
course, of some reasonable explanation. When he left Mr. Baker in the
morning his plan had been to go to Mrs. Morton's apartment and once more
investigate all possible means of entrance, hoping that, by finding out
how the messages were delivered, he might also be able to find out by
whom. It was for this reason that he had asked Mrs. Morton for the key
to the apartment.</p>
<p>Now the question seemed in a fair way to being answered for him. The
fact that this girl's room was located so near to the Mortons' apartment
could not be a mere coincidence. There must be, between her room and the
Morton flat some means of communication, although of what nature he
could not now surmise. Fully convinced, however, that he might very soon
find out, he hurried up to Fifty-seventh Street and walked along until
he reached No. 162.</p>
<p>The house was, like that which immediately adjoined the apartment
building, an old-fashioned one, of brown stone, with a high front stoop.
It presented an appearance which, if not exactly dilapidated, was yet in
strong contrast to the neat appearance of its neighbors. A printed card
in one of the lower front windows indicated that roomers were wanted.</p>
<p>It was just the sort of place that Duvall had expected to find—just the
sort of place in which a working girl like Marcia Ford would live.
Located in a very excellent neighborhood, surrounded by apartment
buildings and houses of the best type, it still could afford to rent
rooms at the moderate figure that one of her class could pay. He went up
the front steps and rang the bell. "Is Miss Ford in? Miss Marcia Ford?"
he asked.</p>
<p>The servant who came to the door, a neatly dressed German girl, shook
her head.</p>
<p>"No, Miss Ford is not in. She usually gets back about half past six."</p>
<p>Duvall glanced at his watch. It was not yet three o'clock. He realized
that he had a long wait before him.</p>
<p>"Will you leave any message?" the girl asked.</p>
<p>"No. It is not important. I will come back." Descending the steps he
walked slowly in the direction of the apartment building, two doors
away.</p>
<p>Entering, he made his way to Mrs. Morton's apartment. The place was just
as they had left it, two days before. The windows had all been tightly
closed and fastened, and there were no further mysterious messages lying
about. Once more Duvall went to Ruth Morton's room, and opening the two
windows looked out.</p>
<p>His investigations, however, told him no more than he had learned
before. The three dormer windows in the home next door gazed vacantly
down at him, their windows covered with cobwebs and dust. The
impossibility of anyone making their way from even the nearest of them,
to the window where he stood, was manifest. And that a long rod or pole
could have been utilized to introduce the letters into the girl's room
was even more impossible. He shook his head, then turned to the other
window, that facing upon the fire escape.</p>
<p>Here, as on the occasion of his previous examination, the smooth glossy
surface of the freshly dried paint showed no marks, except those he had
himself made during his former visit. And yet, as his eyes searched the
grated surface, he saw that there was something there, something that
had not been there before. He reached out and picked it up.</p>
<p>It was a woman's handkerchief, a tiny square of lace-edged linen, of an
inexpensive variety. But it was not the mere presence of the
handkerchief that so interested him. It might readily have belonged to
Miss Morton herself, and have been accidentally dropped from the window.
There were two things about this particular handkerchief, however, that
marked it as a clue of the utmost value. One was the fact that in its
corner was embroidered an initial, the letter "F." The other was that
two of the corners of the handkerchief were knotted together, as though
it had been tied about someone's wrist, for what reason, he could not
imagine.</p>
<p>The latter feature puzzled the detective greatly. He could not form any
hypothesis to account for it. If the Ford woman, as indicated by the
presence of the handkerchief, marked with an "F," had been on the
fire-escape, why were there no tell-tale marks to indicate it? And if
she had not been there, why was her handkerchief found there, knotted in
this peculiar way? Had it formed part of some apparatus, some device,
made of a pole and a cord, for inserting the threatening letters through
the window? If so, it might, of course, have become detached while the
device was being used. Duvall remembered that he had not examined the
fire escape on the night when the astonishing apparition had appeared
beside Ruth Morton's bed, <i>because the window opening on the fire escape
had been closed and locked</i>. Had the handkerchief been left there then?
He sat for a long time in the deserted library, trying to hit upon some
reasonable theory to explain the matter, but his efforts resulted in
failure. Not the least confusing feature of the affair was the fact that
the woman, Marcia Ford, <i>was not the woman he was seeking</i>. He had seen
her at the studio that morning, and knew that she was not the one who
had escaped from the cab the night before. Were there then two working
together? If so, he would, through the Ford girl, in all probability be
able to trace her confederate. He waited patiently until the waning
afternoon light told him that it was time to begin his watch before the
house at number 162.</p>
<p>Across the street a residence, closed for the summer, its front entrance
boarded up, afforded him a convenient place to wait. He sat down upon
the steps, and pretended to be occupied with a newspaper. His eyes,
however, sought constantly the doorway opposite.</p>
<p>A number of persons entered the place, during the next two hours, but
Marcia Ford was not amongst them. As the darkness began to approach, and
lights in the streets and houses flared up, Duvall rose, crossed the
street, and stationed himself at a nearer point, from which he might the
more certainly identify anyone entering the house. Miss Ford, however,
failed to appear.</p>
<p>From the sign in the window, to the effect that roomers were wanted,
Duvall concluded that the Ford girl did not take her meals in the house.
His watch showed him that it was nearly seven. Doubtless she had
arranged to dine before returning home. In a flash it came to him that
his opportunity to make an examination of her room was now at hand.</p>
<p>To secure entrance to the room by the usual channels was clearly out of
the question. The people at the boarding house would, of course, not
permit it. But could he discover the means of communication, whatever
they were, between Miss Morton's apartment and the girl's room, he might
be able to enter the latter unknown and unobserved. He had thought of
attempting this during the afternoon, but realized that he could not
hope to accomplish it, in broad daylight, without being seen by the
occupants of the neighboring buildings, and perhaps arrested as a
burglar or sneak thief.</p>
<p>With a last glance down the street, he hastened back to the apartment
building and made his way to Mrs. Morton's flat. Passing quickly through
Ruth Morton's bedroom, he climbed out upon the fire escape and looked
about.</p>
<p>Below him were the rear yards of the houses fronting on the next street.
To the right he could see the bulk of the apartment building, blocking
his view of the avenue beyond. To the left were the rear buildings of
the adjoining houses. It was quite dark, the sky was starless, but all
about him gleamed the lights in the windows of the neighboring
buildings.</p>
<p>Neither to the right, nor to the left was there any possible way by
which access to the point where he now stood could be gained. From
below, it was possible, although his previous examination had showed him
both the fact that the newly painted surface of the fire escape was
unmarred, and that the ladder at the lower floor was drawn up some nine
or ten feet from the ground. He felt certain that Miss Ford had not
reached Ruth's room in that way.</p>
<p>He glanced upward. The fire escaped stopped at the level of the floor
above. To ascend from it to the roof was impossible.</p>
<p>Remembering that the top apartment was vacant, Duvall re-entered the
building and hunting up the janitor, told him that he desired to get out
on the roof.</p>
<p>The man remembered him, from his first visit, and the inquiries he had
then made about the tenants of the apartment above.</p>
<p>"I am making some special inquiries on Mrs. Morton's behalf," he
explained. "You can go with me, if you like, to see that I do nothing I
shouldn't."</p>
<p>The janitor joined in his laugh.</p>
<p>"I'm not worrying," he rejoined, "but I'll go along, just the same, to
show you the way." He led the detective up one flight of stairs and,
going to the end of the outer hall, unlocked and opened a small door
beside the elevator shaft. A short spiral staircase was disclosed.</p>
<p>Snapping on an electric light, the man ascended the steps, and, after
fumbling for a moment with the catch, threw open a trapdoor leading to
the roof. In a moment both he and Duvall had climbed out upon the tiled
surface. Duvall went to the edge which overlooked the house adjoining,
and peered down. He at once saw something that interested him.</p>
<p>The house with the dormer windows consisted, as has been previously
mentioned, of four stories and an attic. Its roof rose several feet
above the level of the window of Ruth's room, which was on the fourth
floor of the apartment building. But Duvall saw at once that this
elevation of the adjoining house did not extend all the way back, but,
in fact, stopped a little beyond the point where it joined the
apartment. From here to the rear of the lot the building had no attic,
its rear extension being but four stories high. In this position on the
apartment-house roof, the roof of the back building was at least fifteen
feet below him.</p>
<p>Another thing that he noticed at once was the fact that the second
house, No. 162, was of almost the same design as the first, that is, it
consisted of a main building with an attic, and a rear extension,
reaching to the same level as that of the house between. It was clear
that if anyone living in the second house could obtain access to the
roof of the back building, he would be able to walk across that of the
first or adjoining house, and reach a point directly beneath where he
stood.</p>
<p>But, granting the possibility of this, of what use would it be? A person
on the roof below him would in no conceivable way be able to reach
either of the windows of Ruth Morton's room. Was it possible that an
opening had been made through the wall of the apartment building itself?
He thought it unlikely, but determined to investigate.</p>
<p>"I must get down on that roof below," he informed his companion. The
janitor grinned.</p>
<p>"How are you going to do it?" he asked.</p>
<p>"Haven't you a ladder—a rope?"</p>
<p>The man thought a moment.</p>
<p>"I've got a short ladder in the cellar, only about eight feet long, I
guess. I'm afraid it would not do."</p>
<p>"Yes it would," replied Duvall, pointing to the roof of the attic
portion of the house below. "I'll get down to the roof of the main part
of the house first, and from there to the roof of the back building. An
eight-foot ladder will be long enough for that. Bring it up, will you?"</p>
<p>The man hesitated.</p>
<p>"I don't just like this idea of going on other people's roofs," he said.</p>
<p>"You don't need to go. I've got to. I'm a detective, and I'm working for
Mrs. Morton on a most important case." As he spoke, he took a bill from
his pocket and pressed it into the man's hand.</p>
<p>The janitor responded at once.</p>
<p>"I'll fetch it up, sir," he said. "Wait for me here."</p>
<p>Duvall occupied the few moments consumed by the janitor's absence in
examining, by means of his pocket electric torch, the surface of the
roof on which he stood. The smooth flat terra cotta tiles showed no
distinguishing marks. Here and there spots of paint, marred by
footprints, indicated where the painters at work on the building had set
their buckets, no doubt while painting the wooden portions of the
trapdoor, and the metal chimney-pots on the roof.</p>
<p>The man returned in a few moments with the ladder, and Duvall, lowering
it to the level of the main portion of the adjoining house, saw that it
was of sufficient length to permit his descent. In a moment he had
slipped off his shoes, and was cautiously descending the ladder.</p>
<p>Once on the surface of the main roof of the house, he had intended to
take down the ladder and, by means of it, descend the remaining six or
seven feet to the roof of the back building, but he found that means for
this descent already existed. A rough but permanent wooden ladder led
from the higher level to the lower. Duvall judged that it had been
placed there to provide easy communication between the upper roof and
the lower. Leaving the ladder where it stood, he made his way down to
the roof of the back building. It was covered with tin, and he walked
softly in his stockinged feet to avoid being overheard.</p>
<p>His first act was to go to the wall of the apartment house which faced
him, and make a thorough examination of it by the light of his electric
torch. He judged that in the position in which he now stood he was about
on a level with the floor of Ruth's room. The brick wall of the
apartment building facing him was blank, that is, it contained no
windows. After a minute examination, Duvall was forced to the conclusion
that no entrance to the girl's bedroom had been made through it. The
bricks were solid, immovable, the cemented joints firm and unbroken. A
moment later he turned to the left.</p>
<p>Here the rising wall of the attic story of the house faced him, reaching
to a point above his head. Two dusty and long unopened dormer windows,
similar to those facing on the court, confronted him. He remembered that
the servant of the house next door had informed him, earlier in the
week, that the attic was, and long had been, unoccupied.</p>
<p>Whether the attic was tenanted or not, however, had no bearing on the
problem which confronted him. The windows might serve as a means whereby
anyone could reach the roof of the back building from the house proper,
but they did not suggest any means whereby anyone might reach the
windows of Ruth's bedroom. And by ascending to the point on the attic
roof where his ladder stood, the problem was no nearer a solution, for a
person standing there was on the edge of the court between the
buildings, seven feet or more above the girl's bedroom window, and as
many away from it. He turned away, and approaching the rear edge of the
back building, looked over.</p>
<p>To his left, some eight feet away, was the fire escape before the rear
window of the girl's bedroom. Standing on that sharp edge, he realized
that in no way could he reach the railing of the fire escape, except by
jumping, a feat that an expert gymnast might have hesitated to attempt,
at that height above the ground. And could it be done successfully, what
about the crash, the noise which must inevitably result from such a
performance? What about the damage to the paint upon the fire escape's
iron surface? And yet it would seem that a young girl had accomplished
this feat, without noise, without making the least mark to register her
passage. He thought of the tell-tale handkerchief, which he had found on
the fire escape earlier in the evening, then turned back with a feeling
of annoyance. The thing was, he realized, an impossibility.</p>
<p>A sudden sense of the passage of time made him hurry to the roof of the
rear building of the house at No. 162. Like its neighbor, it was built
with an attic story, and in the rear were two dormer windows opening in
the same way upon the lower roof. Could these windows, by any chance, be
those of the room of Marcia Ford? It seemed highly probable, since, if
she had operated from the roof, they could afford an easy way to reach
it. Very cautiously he crept up to the nearer of the two windows and
looked in.</p>
<p>The room before him was in total darkness, and the very faint radiance
from without was not sufficient to enable him to distinguish anything
within it. The window, however, he saw to his delight was open, and the
opening, although small, was quite large enough to enable him to crawl
in. Holding his electric torch in one hand, he crept into the room.</p>
<p>The beam of light from his torch, although powerful, was, of course,
very concentrated. He swept it about the room, to make sure that it was
unoccupied. It was a small room, long and narrow, with the single dormer
window, by which he had just entered, at one end, and a similar one at
the side, in the slanting mansard roof. It contained a small bed, a
chiffonier and dresser, a table, some chairs and a trunk. It was a
woman's room; one glance at the dresser told him that, and a
handkerchief lying crumpled on the latter's top proved to be identical
with the one he had found on the fire escape, both in its general
character, and in the initial "F" in one of its borders. Beyond any
doubt, he was now in Marcia Ford's room.</p>
<p>Had he been inclined to doubt it, two photographs upon the wall would
have convinced him. One was a picture of the Ford girl herself. The
other was a portrait of the woman of the cab, the one that Duvall fully
believed to be the author of the attacks upon Ruth Morton.</p>
<p>He examined the various articles about the room with the utmost care,
but nothing of any interest rewarded his search. It had been his hope
that he might find something of definite value—the typewriter, perhaps,
upon which the threatening letters had been written, the black sealing
wax, used in making the death's-head seals, the paper employed by the
writer. None of these things was in evidence; there was no typewriter,
the table contained a small bottle of ink, a couple of pens, and some
cheap envelopes and a writing tablet of linen paper quite different from
that upon which the warning letters had been written. There was nothing,
absolutely nothing, in the place to connect its occupant with the
sending of the letters, except the room's location, in such close
proximity to that of Ruth Morton, and the photograph of the woman of the
cab, hanging upon the wall.</p>
<p>Duvall, greatly disappointed, was about to take his departure, when he
observed at the far end of the room a door. Whether it led to another
room, or to a bathroom, or merely to a closet, he did not, of course,
know. There was danger, he fully realized, that Marcia Ford might return
at any moment. There was equal danger that, upon opening the door, he
might find himself in another room, possibly an occupied one. He thought
at one time that he heard sounds on the far side of the door, but when
he paused and stood listening he could distinguish nothing, and
concluded that he had been mistaken. Shutting off the light of his
pocket torch for the moment, in order that, should the entrance lead to
another room, its rays might not betray his presence, Duvall grabbed the
door knob, and, turning it softly, opened the door.</p>
<p>For a moment he had a glimpse of a black cavern, and then, with
incredible swiftness, something struck him a heavy blow in the face.
What it was he was too much surprised and stunned to realize. His
electric lamp fell from his hand, and clattered to the floor.</p>
<p>Realizing his helplessness in the almost total darkness, he bent down,
groping about in an unsuccessful effort to recover the searchlight. And
then, with a loud cry, a heavy body projected itself upon him, grasping
wildly at his hair. An arm, clothed in some silken material, encircled
his throat. He felt himself choking. And at the same moment a strange
and irrational terror seized him. He seemed in the grasp of something
uncanny, something inhuman, in spite of its very human cries. With a
shudder he sprang to his feet, unable to locate the missing electric
torch, and shaking the shrieking figure from him, plunged toward the
window by which he had entered. It was not alone the surprise, the
nameless terror of the thing, that sent Duvall headlong from the room.
He fully realized that the noise of the encounter, the shrieks of his
assailant, would quickly bring the other inmates of the house to the
room. He had no wish to be discovered there—his entrance had been too
irregular, too illegal, for that. With extraordinary rapidity he flung
himself through the window and without waiting to observe the results of
his intrusion, sped swiftly across the roofs of the two buildings, up
the steps to the attic roof, and from there, by means of the ladder, to
the roof of the apartment building. The janitor sat where he had left
him, smoking a pipe. Duvall looked back. Lights were visible in the room
he had just left. He saw a figure, one that closely resembled Marcia
Ford, cross the lighted area of the window. There was a second figure
with her—smaller, shorter, he thought. Who—what was it that had
attacked him? He stood in a daze, unable to grasp the meaning of the
experience through which he had just passed.</p>
<p>The janitor took his pipe from his mouth and rose.</p>
<p>"Find what you were looking for?" he asked with a grin. Duvall shook his
head.</p>
<p>"No," he said. "Not exactly. But I'm on the track of it."</p>
<p>"Want the ladder any more?"</p>
<p>"No, not to-night." He assisted the man to draw it up to the roof.</p>
<p>A few moments later he had reached the sidewalk. He glanced at his
watch. It was just eight o'clock. As he walked toward the entrance of
the house at No. 162, the front door opened, and a woman came out.</p>
<p>Duvall quickened his pace, but the woman was also apparently in a great
hurry. She ran swiftly across the sidewalk, and sprang into a cab which
stood beside the curb. Duvall was able to get but a fleeting glance at
her, but that glance was enough to convince him that she was the
mysterious prisoner who had so neatly given him the slip while in the
cab the night before. He sprang forward with a cry, but before he had
come within ten feet of the cab, the vehicle dashed off and proceeded at
a rapid rate up the street.</p>
<p>A second cab came along at almost the same moment. Duvall hailed it, but
the driver shook his head, indicating that he had a fare. In a moment
the second cab had passed, apparently in hot pursuit of the first. There
were no other cabs in sight. With a growl of anger and annoyance Duvall
turned back to the door of No. 162.</p>
<p>Should he ring the bell and ask for Miss Ford? he wondered. Of what use
would it be, to request an interview? Yet there seemed to be nothing
else that he could do. Miss Ford had not left the house, although the
other woman, apparently her confederate, had done so. He stood in the
shadow of the apartment building, trying to decide what move he should
make next.</p>
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