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.
"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?"
"Yes, that'll be fine!" said Dick. "Come on!"
"Not so fast!" said a harsh voice behind them. 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.
"So you are spying on my house, are you?" he said.
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