t service can grab the
entire organization at once and end this treachery for good."

Captain Hardy paused and looked uneasily across the room, as though
lost in thought. His companions were quiet as mice, each also busy
with his own thoughts.

"It's a long, hard task, boys," said the captain, after a time, and he
drew a deep breath, "a long task and, from now on, a dangerous task.
Whatever you do, boys, remember the Chief's warning. Above all else,
we must be careful not to alarm the men we are watching."

As Captain Hardy rose to get his hat he said, "I don't quite see how we
are to follow this motor-car driver without being detected. So I am
going over to Manhattan to see the agent the Chief has put in charge of
this investigation. Perhaps I'll have some interesting news for you
when I return. Meantime, keep your eyes and ears open and be careful."

With renewed interest and determination the members of the wireless
patrol returned to their posts. But though they listened faithfully at
the wireless and uninterruptedly watched the hawk's nest on the cliff
below them, no alarming sound came out of the air and no suggestive
movement occurred within their vision.

Their captain came back with a smile of satisfaction on his face. But
the members of the wireless patrol were too well disciplined to
question their leader. They knew that, as always before, he would give
them the proper orders at the proper time; and that if they obeyed
those orders faithfully and intelligently, success would follow. But
Captain Hardy was different in many respects from other commanders, and
his subordinates were not at all like ordinary privates in an army.
There was no question as to their loyalty, discretion, or intelligence;
and their leader believed he could attain the greatest success by
taking them into his confidence. So presently he answered the question
that each boy was longing to ask.

From his pocket he produced detailed maps of all the neighboring
country, so mounted on cheese-cloth, after being cut into squares, that
they could be folded into small size without injuring the maps
themselves. Thus the bearer could always follow his route, whether he
walked or rode, whether the air was calm or the wind blew fiercely, by
carrying in his hand the necessary map folded in small compass.

Now Captain Hardy spread out his maps full length on a table, and for
half an hour the little group bent over them, heads close toge