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say： that it is no ordinary love escapade。 You saw the woman's face at
the sign of danger。 We have heard； too； of the attack upon the
landlord； which was undoubtedly meant for the lodger。 These alarms；
and the desperate need for secrecy； argue that the matter is one of
life or death。 The attack upon Mr。 Warren further shows that the
enemy； whoever they are； are themselves not aware of the
substitution of the female lodger for the male。 It is very curious and
complex； Watson。〃
〃Why should you go further in it？ What have you to gain from it？〃
〃What； indeed？ It is art for art's sake； Watson。 I suppose when
you doctored you found yourself studying cases without thought of a
fee？〃
〃For my education； Holmes。〃
〃Education never ends； Watson。 It is a series of lessons with the
greatest for the last。 This is an instructive case。 There is neither
money nor credit in it； and yet one would wish to tidy it up。 When
dusk comes we should find ourselves one stage advanced in our
investigation。〃
When we returned to Mrs。 Warren's rooms； the gloom of a London
winter evening had thickened into one gray curtain； a dead monotone of
colour； broken only by the sharp yellow squares of the windows and the
blurred haloes of the gas…lamps。 As we peered from the darkened
sitting…room of the lodging…house； one more dim light glimmered high
up through the obscurity。
〃Someone is moving in that room；〃 said Holmes in a whisper； his
gaunt and cager face thrust forward to the window…pane。 〃Yes； I can
see his shadow。 There he is again！ He has a candle in his hand。 Now he
is peering across。 He wants to be sure that she is on the lookout。 Now
he begins to flash。 Take the message also； Watson； that we may check
each other。 A single flash… that is A； surely。 Now； then。 How many did
you make it？ Twenty。 So did I。 That should mean T。 AT… that's
intelligible enough！ Another T。 Surely this is the beginning of a
second word。 Now； then… TENTA。 Dead stop。 That can't be all； Watson？
ATTENTA gives no sense。 Nor is it any better as three words AT； TEN；
TA； unless T。 A。 are a person's initials。 There it goes again！
What's that？ ATTE… why； it is the same message over again。 Curious；
Watson； very curious！ Now he is off once more！ AT… why； he is
repeating it for the third time。 ATTENTA three times！ How often will
be repeat it？ No； that seems to be the finish。 He has withdrawn from
the window。 What do you make of it； Watson？〃
〃A cipher message； Holmes。〃
My companion gave a sudden chuckle of comprehension。 〃And not a very
obscure cipher； Watson；〃 said he。 〃Why； of course； it is Italian！
The A means that it is addressed to a woman。 'Beware！ Beware！ Beware！'
How's that； Watson？〃
〃I believe you have hit it。〃
〃Not a doubt of it。 It is a very urgent message； thrice repeated
to make it more so。 But beware of what？ Wait a bit； he is coming to
the window once more。〃
Again we saw the dim silhouette of a crouching man and the whisk
of the small flame across the window as the signals were renewed。 They
came more rapidly than before… so rapid that it was hard to follow
them。
PERICOLO… pericolo… eh； what's that； Watson？ 'Danger；' isn't it？
Yes； by Jove； it's a danger signal。 There he goes again！ PERI。 Halloa；
what on earth…〃
The light had suddenly gone out； the glimmering square of window had
disappeared； and the third floor formed a dark band round the lofty
building； with its tiers of shining casements。 That last warning cry
had been suddenly cut short。 How； and by whom？ The same thought
occurred on the instant to us both。 Holmes sprang up from where he
crouched by the window。
〃This is serious； Watson；〃 he cried。 〃There is some devilry going
forward！ Why should such a message stop in such a way？ I should put
Scotland Yard in touch with this business… and yet； it is too pressing
for us to leave。〃
〃Shall I go for the police？〃
〃We must define the situation a little more clearly。 It may bear
some more innocent interpretation。 Come； Watson； let us go across
ourselves and see what we can make of it。〃
As we walked rapidly down Howe Street I glanced back at the building
which we had left。 There； dimly outlined at the top window； I could
see the shadow of a head； a woman's head； gazing tensely； rigidly； out
into the night； waiting with breathless suspense for the renewal of
that interrupted message。 At the doorway of the Howe Street flats a
man； muffled in a cravat and greatcoat； was leaning against the
railing。 He started as the hall…light fell upon our faces。
〃Holmes！〃 he cried。
〃Why； Gregson！〃 said my companion as he shook hands with the
Scotland Yard detective。 〃Journeys end with lovers' meetings。 What
brings you here？〃
〃The same reasons that bring you； I expect；〃 said Gregson。 〃How
you got on to it I can't imagine。〃
〃Different threads； but leading up to the same tangle。 I've been
taking the signals。〃
〃Signals？〃
〃Yes； from that window。 They broke off in the middle。 We came over
to see the reason。 But since it is safe in your hands I see no
object in continuing the business。〃
〃Wait a bit！〃 cried Gregson eagerly。 〃I'll do you this justice；
Mr。 Holmes； that I was never in a case yet that I didn't feel stronger
for having you on my side。 There's only the one exit to these flats；
so we have him safe。〃
〃Who is he？〃
〃Well； well； we score over you for once； Mr。 Holmes。 You must give
us best this time。〃 He struck his stick sharply upon the ground； on
which a cabman； his whip in his band； sauntered over from a
four…wheeler which stood on the far side of the street。 〃May I
introduce you to Mr。 Sherlock Holmes？〃 he said to the cabman。 This
is Mr。 Leverton； of Pinkerton's American Agency。〃
〃The hero of the Long Island cave mystery？〃 said Holmes。 〃Sir； I
am pleased to meet you。〃
The American； a quiet； businesslike young man； with a
clean…shaven； hatchet face； flushed up at the words of commendation。
〃I am on the trail of my life now； Mr。 Holmes；〃 said he。 〃If I can get
Gorgiano…〃
〃What！ Gorgiano of the Red Circle？〃
〃Oh； he has a European fame； has he？ Well； we've learned all about
him in America。 We know he is at the bottom of fifty murders； and
yet we have nothing positive we can take him on。 I tracked him over
from New York； and I've been close to him for a week in London；
waiting some excuse to get my hand on his collar。 Mr。 Gregson and I
ran him to ground in that big tenement house； and there's only the one
door； so he can't slip us。 There's three folk come out since he went
in； but I'll swear he wasn't one of them。〃
〃Mr。 Holmes talks of signals；〃 said Gregson。 〃I expect； as usual； he
knows a good deal that we don't。〃
In a few clear words Holmes explained the situation as it had
appeared to us。 The American struck his hands together with vexation。
〃He's on to us！〃 he cried。
〃Why do you think so？〃
〃Well； it figures out that way； does it not？ Here he is； sending out
messages to an accomplice… there are several of his gang in London。
Then suddenly； just as by your own account he was telling them that
there was danger； he broke short off。 What could it mean except that
from the window he had suddenly either caught sight of us in the
street； or in some way come to understand how close the danger was；
and that he must act right away if he was to avoid it？ What do you
suggest； Mr。 Holmes？〃
〃That we go up at once and see for ourselves。〃
〃But we have no warrant for his arrest。〃
〃He is in unoccupied premises under suspicious circumstances；〃
said Gregson。 〃That is good enough for the moment。 When we have him by
the heels we can see if New York can't help us to keep him。 I'll
take the responsibility of arresting him now。〃
Our official detectives may blunder in the matter of intelligence；
but never in that of courage。 Gregson climbed the stair to arrest this
desperate murderer with the same absolutely quiet and businesslike
bearing with which he would have ascended the official staircase of
Scotland Yard。 The Pinkerton man had tried to push past him； but
Gregson had firmly elbowed him back。 London dangers were the privilege
of the London force。
The door of the left…hand flat upon the third landing was standing
ajar。 Gregson pushed it open。 Within all was absolute silence and
darkness。 I struck a match and lit the detective's lantern。 As I did
so； and as the flicker steadied into a flame； we all gave a gasp of
surprise。 On the deal boards of the carpetless floor there was
outlined a fresh track of blood。 The red steps pointed towards us
and led away from an inner room； the door of which was closed。 Gregson
flung it open and held his light full blaze in front of him； while
we all peered eagerly over his shoulders。
In the middle of the floor of the empty room was huddled the
figure of an enormous man； his clean…shaven； swarthy face
grotesquely horrible in its contortion and his head encircled by a
gh