<p id="id00338">Morning saw them up on time, and off to Ealing. There Colonel<br/>
Throckmorton gave them their orders.<br/></p>
<p id="id00339">"I've requisitioned motorcycles for you," he said. "Make sure of the
location of the house, so that you can mark it on an ordnance map for
me. Then use your own judgment, but find the next house. I have had
letters prepared for you that will introduce you to either the mayor or
the military commander in any town you reach and you will get quarters
for the night, if you need them. Where do you think your search will
lead you, Fleming?"</p>
<p id="id00340">He eyed Harry sharply as he asked the question. "Somewhere on the East
coast, I think, sir," replied Harry.</p>
<p id="id00341">"Well, that remains to be seen. Report by telegraph, using this code.
It's a simplified version of the official code, but it contains all you
will need to use. That is all."</p>
<p id="id00342">Finding the house, when they started on their motorcycles, did not prove
as difficult a task as Harry had feared it might. They both remembered a
number of places they had marked from the cab windows, and it was not
long before they were sure they were drawing near.</p>
<p id="id00343">"I remember that hill," said Harry. "By Jove—yes, there it is! On top
of that hill, do you see? We won't go much nearer. I don't want them to
see us, by any chance. All we need is to notice which way they're
signalling."</p>
<p id="id00344">They watched the house for some time before there was any sign of life.
And then it was only the flashes that they saw. Since the previous day
some sort of cover had been provided for the man who did the signalling.</p>
<p id="id00345">"What do you make of it, Dick?" asked Harry eagerly, after the flashing
had continued for some moments.</p>
<p id="id00346">"It looks to me as if they were flashing toward the north and a little
toward the west," said Dick, puzzled.</p>
<p id="id00347">"That's the way it seems to me, too," agreed Harry. "That isn't what we
expected, either, is it?"</p>
<p id="id00348">"Of course we can't be sure."</p>
<p id="id00349">"No, put it certainly looks that way. Well, we can't make sure from
here, but we've got to do it somehow. I tell you what. We'll circle
around and get northwest of the house. Then we ought to be able to tell
a good deal better. And if we get far enough around, I don't believe
they'll see us, or pay any attention to us if they do."</p>
<p id="id00350">So they mounted their machines again, and in a few moments were speeding
toward a new and better spot from which to spy on the house. But this,
when they reached it, only confirmed their first guess. The signals were
much more plainly visible here, and it was obvious now, as it had not
been before, that the screen they had noticed had been erected as much
to concentrate the flashes and make them more easily visible to a
receiving station as to conceal the operator. So they turned and figured
a straight line as well as they could from the spot where the flashes
were made. Harry had a map with him, and on this he marked, as well as
he could, the location of the house. Then he drew a line from it to the
northwest.</p>
<p id="id00351">"The next station must be on this line somewhere," he said. "We'll stick
to it. There's a road, you see, that we can follow that's almost
straight. And as soon as we come to a high building we ought to be able
to see both flashes—the ones that are being sent from that house and
the answering signals. Do you see?"</p>
<p id="id00352">"Yes, that'll be fine!" said Dick. "Come on!"</p>
<p id="id00353">"Not so fast!" said a harsh voice behind them.</p>
<p id="id00354">They spun around, and there, grinning a little, but looking highly
determined and dangerous, was the same man they had seen the day before,
and who had questioned them when the tire of their taxicab blew out! But
now he was not in uniform, but in a plain suit of clothes.</p>
<p id="id00355">"So you are spying on my house, are you?" he said. "And you lied to me
yesterday! No troops were sent to Croydon at all!"</p>
<p id="id00356">"Well, you hadn't any business to ask us!" said Dick, pluckily. "If you
hadn't asked us any questions, we'd have told you no lies."</p>
<p id="id00357">"I think perhaps you know too much," said the spy, nodding his head,
"You had better come with me. We will look after you in this house that
interests you so greatly."</p>
<p id="id00358">He made a movement forward. His hand dropped on Dick's shoulder. But as
it did so Harry's feet left the ground. He aimed for the spy's legs,
just below the knee, and brought him to the ground with a beautiful
diving tackle—the sort he had learned in his American football days. It
was the one attack of all others that the spy did not anticipate, if,
indeed, he looked for any resistance at all. He wasn't a football
player, so he didn't know how to let his body give and strike the ground
limply. The result was that his head struck a piece of hard ground with
abnormal violence, and he lay prone and very still.</p>
<p id="id00359">"Oh, that was ripping, Harry!" cried Dick. "But do you think you've
killed him?"</p>
<p id="id00360">"Killed him? No!" said Harry, with a laugh.</p>
<p id="id00361">"He's tougher than that, Dick!"</p>
<p id="id00362">But he looked ruefully at the spy.</p>
<p id="id00363">"I wish I knew what to do with him," he said. "He'll come to in a little
while. But—"</p>
<p id="id00364">"We can get away while he's still out," said Dick, quickly. "He can't
follow us and we can get such a start with our motorcycles."</p>
<p id="id00365">"Yes, but he'll know their game is up," said Harry. "Don't you see,
Dick? He'll tell them they're suspected—and that's all they'll need in
the way of warning. When men are doing anything as desperate as the sort
of work they're up to in that house, they take no more chances than they
have to. They'd be off at once, and start up somewhere else. We only
stumbled on this by mere accident—they might be able to work for weeks
if they were warned."</p>
<p id="id00366">"Oh, I never thought of that! What are we to do, then?'</p>
<p id="id00367">"I wish I knew whether anyone saw us from the house or if they didn't—!<br/>
Well, we'll have to risk that. Dick, do you see that house over there?<br/>
It's all boarded up—it must be empty."<br/></p>
<p id="id00368">"Yes, I see it." Dick caught Harry's idea at once this time, and began
measuring with his eye the distance to the little house of which Harry
had spoken. "It's all down hill—I think we could manage it all right."</p>
<p id="id00369">"We'll try it, anyhow," said Harry. "But first we'd better tie up his
hands and feet. He's too strong for the pair of us, I'm afraid, if he
should come to."</p>
<p id="id00370">Once that was done, they began to drag the spy toward the house. Half
carrying, half pulling, they got him down the slope, and with a last
great effort lifted him through a window, which, despoiled of glass, had
been boarded up. They were as gentle as they could be, for the idea of
hurting a helpless man, even though he was a spy, went against the
grain. But—</p>
<p id="id00371">"We can't be too particular," said Harry. "And he brought it on himself.<br/>
I'm afraid he'll have worse than this to face later on."<br/></p>
<p id="id00372">They dumped him through the window, from which they had taken the
boards. Then they made their own way inside, and Harry began to truss up
the prisoner more scientifically. He understood the art of tying a man
very well indeed, for one of the games of his old scout patrol had
involved tying up one scout after another to see if they could free
themselves. And when he had done, he stepped back with a smile of
satisfaction.</p>
<p id="id00373">"I don't believe he'll get himself free very soon," he said. "He'll be
lucky if that knock on the head keeps him unconscious for a long time,
because he'll wake up with a headache, and if he stays as he is he won't
know how uncomfortable he is."</p>
<p id="id00374">"Are we going to leave him like that, Harry?"</p>
<p id="id00375">"We've got to, Dick. But he'll be all right, I am going to telephone to
Colonel Throckmorton and tell him to send here for him, but to do so at
night, and so that no one will notice. He won't starve or die of thirst.
I can easily manage to describe this place so that whoever the colonel
sends will find it. Come on!"</p>
<p id="id00376">They went back to their cycles and rode on until they came to a place
where they could telephone. Harry explained guardedly, and they went on.</p>
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