whole harbor where you can get such a good view of them.
I just know he had something to do with that message."

"I'll bet the Germans have got a string of wireless outfits and that
what he does is to stay in that house and spy on ships that pass
through the Narrows and then telephone to one of these secret wireless
stations," said the nimble-witted Roy. "And if that's the case he
hasn't any wireless at all himself."

"If Roy is right," said Henry, "it's a pretty clever scheme. The
secret service could take his house to pieces and not find a wire in
it. Yet he's the man that's sending the messages, or at least starting
them."

"Roy is doubtless correct," said their leader. "We know they have at
least three stations and they may have many more. The object of that,
of course, is to baffle any wireless man who may be on their track. If
we hadn't stumbled on this spy post at Staten Island, we should have
been completely blocked ourselves. But we've got something definite to
work on now. We've got a definite clue. And sooner or later we will
uncover some of their hidden stations. From now on we've got to watch
this man on Staten Island as well as listen for messages. I don't see
how we are to do it unless we send for more of the boys or move to
Staten Island."

When the matter was laid before Chief Flynn he said no more boys were
needed. Too many boys in one house would attract attention. So he
arranged to transfer the wireless patrol to Staten Island. Living on
the slope above the suspected house was a well-to-do but childless
couple with a rather large house, who were warm friends of the Chief's;
and they readily agreed, as a matter of service to their country, to
take the wireless patrol into their home. So a wireless outfit was
installed, with a concealed aerial, and the boys found themselves
situated even more pleasantly than they had been before.

And it was well that they were pleasantly situated, for though their
task was not difficult in one sense, in another it was extremely
trying. Six hours a day each boy sat at the wireless listening in.
Had it been possible to tune to longer wave lengths and pick up the
interesting news with which the air was fairly alive, the task would
have been anything but irksome. But to sit hour after hour with their
instruments tuned to the short wave lengths used by the German agents
and hear nothing, was trying enough. The watch on the spy's nest
proved hardly l