lashed in Henry's eyes. "I'll do my best," he
said simply.

"I know you will," rejoined his leader. Then he added, with a smile,
"Now we'll go back to the eagle's nest and wait for the hawk to appear."

CHAPTER X

THE PURSUIT IN THE DARK

Day followed day but that bird of prey did not appear. "A watched pot
never boils," said Henry at last, trying to conquer his impatience; and
he turned his mind from the task of following the automobile driver to
the even more difficult task of securing one of the dollars. For
sooner or later the wireless patrol would have to procure one of these
mysterious coins. But Henry could see no way to accomplish that end
without alarming the quarry. Day after day the little patrol discussed
the question. It was useless to think of securing a coin from the man
on the cliff, from the grocer's boy, or from the grocer himself; for
none of the three had possession of the coins very long after they were
marked. And what became of the coins after they left the grocer's
hands could as yet be only guessed at.

Again and again, as the days passed, the members of the wireless patrol
discussed the secret of the dollars, but nowhere could they find even
the suggestion of a solution. Slowly time dragged on. Day followed
day. The watch grew monotonous and tiresome. There were no signs of
hostile activity in the hawk's nest and the secret service had no
suspicious telephone conversations to report. It required all their
resolution to keep the young scouts at their task of listening in.
They even began to think that they had been detected and that the
activities of the spy in the hawk's nest were ended.

Then, one afternoon, galvanizing them to sudden action, came a cryptic
message from the secret service, announcing that the Federal Sugar
Company could use experienced refiners at once. Henry took the
message, and recalling what Captain Hardy had told the woman when they
went to see the motor-cycle, at once guessed its meaning. He ran to
Captain Hardy and repeated it.

"You guessed rightly," said Captain Hardy. "Hereafter we, too, have to
use code messages, and we just carried out the spy idea about sugar.
This message is to warn us that transports are sailing. Go to your
stations, boys."

Lew flew back to the wireless. Roy and Willie hustled down to the pine
grove. Henry, his heart beating fast, hurried away to his motorcycle
station.

For a long, long time nothing happene