Our new discovery seemed to me so remarkable that I lost no time in
impressing upon Madame Gabrielle the imperative necessity of the closest
possible scrutiny of Blind Heinrich's actions. I was more than anxious
that we should not lose sight of him for an instant, and that I should
be kept fully informed of his every action. For by this time I was
firmly convinced that, through some medium which we had yet to discover,
he was in some way keeping up communication with the more active agents
of the enemy. And if we could but discover the channel through which
the stream of communications flowed, it would not be long, I felt sure,
before we had the key to the mystery in our hands.
Suddenly, and without any obvious reason, Heinrich completely changed
his habits. Hitherto always on the move, he took to remaining indoors
all day, hardly ever going out except for a short stroll in the evening.
He met no one and apparently spoke scarcely a word to anybody. What
his numerous pupils thought of his sudden neglect of them I cannot say.
But it was clear enough that something important must have occurred to
induce him thus suddenly to abandon what was, professedly at any rate,
his sole means of livelihood.
I was discussing him--he was almost invariably our sole topic of
conversation nowadays--with Madame Gabrielle as she sat in my room one
morning.
"I cannot conceive of any reason," I said, "why Heinrich should have so
suddenly changed the entire routine of his existence. It looks to me as
though either something very important has happened or that he is
expecting important news. Yet he receives no messages; he never gets
even a letter or a telegram."
"There is only one fact that is peculiar," said the smart Frenchwoman.
"You know I have been looking after him pretty closely lately. Well,
whenever he goes out, though he appears to wander about quite aimlessly,
he invariably contrives his walk so that it takes him through Lembridge
Square. He never misses."
"Does he always go the same side of the Square?" I asked.
She replied in the affirmative, and I decided to have a look round the
Square for myself at once.
That same afternoon found me on the scene of Blind Heinrich's daily
walk. The Square itself varied little from hundreds of others in
London: it showed every evidence of dreary respectability common to half
the squares in London. Two things, however, attracted my notice.
In the ground-floor window of one house was a big brass cage containing
a grey parrot, which was insistently emitting the hideous noises common
to the parrot tribe. In a similar window about a dozen houses away was
a case containing some old-fashioned wax flowers beneath a glass dome,
evidently a survival from the ornamental style peculiar to the early
Victorian epoch to which, indeed, the whole dreary Square seemed to
belong.
There was nothing to offer a lucid explanation of why Blind Heinrich
should choose such a path for his daily ramble. There were dozens of
other far more attractive promenades within easy walking distance. Yet
here, unless my instinct entirely misled me, was the solution to our
riddle.
Day after day I followed the old fellow's route. I even went so far as
to shadow Heinrich himself more than once and verified Madame
Gabrielle's observation. No matter which way he started out, he never
failed, on either the outward or homeward journey, to pass along that
particular side of the Square. Yet he never spoke to anyone, and I was
morally certain that no signal was ever made to him from any of the
houses.
On the fourth day I noticed a slight fact. The ring on the top of the
parrot's cage was tied with a big bow of yellow ribbon. Three days
later it was altered to dark blue. On the eighth day it had returned to
yellow again.
Why these changes? Were they signals?
That night enemy aircraft crossed the south-east coast, but their
attempts to reach London were defeated by the terrific fire of the
anti-aircraft guns and by a swift concentration of our fighting
aeroplanes, which broke up several successive squadrons, and sent the
raiders hurrying home again.
Several of my capable assistants then took over the task of finding out
all that was known regarding the house in Lembridge Square. Forty-eight
hours later I had a full report. I learned that the man in whose room
the parrot lived was one of the mysterious band who foregathered to meet
Kristensten in the empty house in Harrington Street. He was then
dressed as a special constable, a part which, by the way, he had no
right whatever to play. He bore the thoroughly English name of Mostyn
Brown, and was in business in the City as the agent of a Manchester firm
of cotton merchants. Apart from the fact of his presence that night in
Harrington Street, nothing that the most exhaustive inquiries revealed
suggested in the smallest degree any association with agents of the
enemy. To all appearances he was a perfectly respectable City man, in
no way different from thousands of others. But--there was a very big
but: what was his business in the dead of night in an empty house in the
West End in company of a suspected German spy?
A few days later the men who were keeping the houses in Lembridge Square
and Hereford Road under surveillance sent me a strange report, which set
me thinking deeply. By some means--whether he suspected he was being
watched or whether a lucky chance favoured him, we never knew--Blind
Heinrich managed to elude the unwearying vigilance of Madame Gabrielle
and arrived alone, evidently in a hurry, at Westbourne Grove. Here he
hailed a taxi and was driven to Waterloo Station. There at the
booking-office on the loop-line side he had met a short, fat man, to
whom, after a brief conversation, he handed a bottle wrapped in white
paper. They remained in conversation a few minutes longer and then
parted. The fat man was followed to the tube railway and thence to
King's Cross, where he had bought a ticket for Peterborough, and left by
the five-thirty express.
Why Peterborough, I wondered? There were certainly no facilities there
for anyone engaged in Germany's nefarious work. But attached to the
report was a snapshot--taken secretly, of course--which showed me at
once that the little fat man was apparently a sailor, "camouflaged"
hastily in a badly fitting overcoat and a cloth cap. That gave me a
further clue. I took down a Bradshaw, and, glancing at the train by
which the little fat man had travelled, made an interesting discovery.
It was the Newcastle express. I began to see why the mysterious little
man had booked to Peterborough. That afternoon I ascertained that the
parrot's cage in the house in Lembridge Square sported a broad ribbon of
yellow satin. At midnight I rang up Hecq at his house at St Germain,
and asked him to send Aubert the detective over at once.
An hour after midnight came another air-raid alarm--the second to
coincide with the appearance of the yellow ribbon.
Now one coincidence of this kind may mean nothing. Two begin to be
suspicious. A third is convincing. I found my suspicions deepening
into certainty.
Directly the air-raid warning was given, our watchers in Harrington
Street were keenly on the alert, but, though they watched all night,
there was no meeting of the mysterious men in the empty house. I
guessed the reason. The raiders were again driven back before they
could reach the Metropolis, and, therefore, there was no news to be
gathered for transmission to the authorities in Berlin. Everything now
pointed with increasing certainty to the house in Lembridge Square as a
focus of enemy activity.
Directly the "All clear" had been sounded over the London area, Heinrich
left Hereford Road, and, according to Madame Gabrielle's report to me,
hurried round to the house of the grey parrot. He remained there about
half an hour, and then retraced his steps home in the waning moonlight.
Thus mystery followed mystery. What was the meaning of the various
coloured bows on the parrot's cage? For that they had a very definite
meaning I no longer doubted. It seemed, indeed, tolerably clear that
the yellow ribbon betokened a coming raid. And evidently the half-blind
old musician was a close friend of the manufacturers' agent. But who,
in reality, was the mysterious Mostyn Brown, and, if he were indeed an
enemy agent, how had he managed to elude the close watch that had been
set upon him?
It had struck me that the house which sheltered the grey parrot might
conceivably conceal a wireless plant of sufficient power to convey a
message to a submarine lurking off the coast. Such a plant need not be
a conspicuous affair. But one of my agents, posing as an official of
the Metropolitan Water Board, had been able to negative the suggestion,
and I confess I found myself still hopelessly puzzled as to the means by
which information of the damage done by the raiding aircraft was so
speedily and so accurately conveyed to the enemy.
By this time Aubert had arrived from Paris, and had taken an obscure
lodging in Chessington Street, a dingy thoroughfare off the Euston Road.
By appointment I met him late one night at the corner of Grey's Inn
Road and Holborn, and, having explained to him briefly what had
occurred, told him to hold himself in readiness for instant action.
The apparent abandonment of the secret meetings in Harrington Street was
a source of considerable anxiety and chagrin. I was particularly
anxious about them. We had several of those who had taken part in the
first meeting under close observation, but had learned nothing about
them sufficient to justify our taking strong action. Most of them,
indeed, seemed to be of the same apparently blameless type as Mr Mostyn
Brown, and it was evident that if they were indeed enemy agents they had
been selected or appointed by a master-hand at the game of espionage.
And I wanted badly to gain some more information about them.
Madame Gabrielle was ever on the alert, and soon it appeared from her
report that the blind fiddler was expecting another raid. The ribbon
bow on the parrot's cage changed to dark blue, and remained so for six
days. On the seventh it was replaced by yellow. That night the old man
remained in his room reading for hours after all the other inmates had
retired. But that night no raid was made.
I now began to think that it would be well if I took the mysterious
Mostyn Brown under my own special observation. For a week during the
moonless nights I shadowed him closely. I found out that he was a
member of a certain third-class City club, frequented by a large number
of "pure-blooded Englishmen" who happened to bear German names--of
course they had been naturalised--and very soon my name appeared on the
club books.
It was not long before I managed to scrape acquaintance with Mostyn
Brown over a game of billiards. I cultivated his friendship eagerly,
and very soon we were on excellent terms. As a matter of fact, I wanted
an invitation to his house, and at last I got it.
I spent there one of the dullest evenings of my life, an evening, as it
happened, entirely wasted. Beyond noting that the ribbon on the
parrot's cage had again turned to blue, I saw nothing of the slightest
interest.
The next night, however, I made a discovery. Dropping in at the club, I
found Mostyn Brown engaged in a game of billiards with a man whom I knew
in the club as Harry Smith. A bullet-headed, bespectacled person, with
hair standing erect as the bristles of a blacking brush, Smith looked
the typical Hun, and I very soon decided in my own mind that Heinrich
Schmidt was probably the name by which he was first known to the world.
Suddenly a dispute arose about some point in the game, and in a moment
words were running high. Half a dozen spectators noisily joined in the
altercation, and the room was a Babel of dispute. I saw my chance.
Taking Mostyn Brown's side, I suddenly interjected a sentence in German.
Apparently hardly noticing the change in his excitement Mostyn Brown
replied in the same language, and his accent told me at once that he was
not of British birth. There was no possibility of mistake, for, however
well the Hun may speak our tongue, he will inevitably betray himself
when in a moment of excitement he lapses into his own language.
My suspicions of Mostyn Brown were naturally intensified a hundredfold
by this discovery. Of course, I redoubled my efforts, and was in daily
conference with certain highly placed people in Whitehall, whose
curiosity was now fully roused, as well as with my own agents, the
vivacious Madame Gabrielle and the slow, but painstaking and relentless,
Aubert. The watch on the suspects became closer than ever, and I was
convinced that, try how he might, none of them could move, practically
speaking, without full details of what he was doing reaching me in the
course of an hour or two at most. And I was ready to strike hard at the
earliest moment when decisive action might seem justified.
For the moment, however, there was nothing to be done but watch and
wait, tense and expectant, while night by night the moon drew nearer and
nearer to the full. Thanks to the information I was able to place
before the authorities in Whitehall, there was little chance of the
anti-aircraft defences of London being caught napping, while the secret
signal I had discovered--the changing of the coloured ribbon on the
parrot's cage at Mostyn Brown's house in Lembridge Square--would be
almost certain to give us warning of any long-arranged raid in force.
Apart from the sequel, the worst we had to expect was a sudden dash by a
few machines in the event of an unexpected improvement in the weather
rendering such a course possible. But with regard to the big raids,
involving days of patient preparation, settled weather, and most careful
and thorough organisation, we felt tolerably sure that the tell-tale
ribbon would give us the warning we wanted. So it proved in the event,
and once again the Hun's trickiness brought his carefully planned scheme
to failure.