n Hardy to Willie and
Roy. "If any one comes out of the house trail him. Now we'll find out
whether this spy--if he be a spy--telephones his news or sends it out
by messenger. The Chief has had the telephone wires tapped and is
receiving a record of all conversations."

Lew continued his watch aloft. Henry sat tense at the wireless,
waiting to catch any possible message, and Roy and Willie scrambled
cautiously down to their favorite observation post in the pines. On
came the transports, riding the waves in a stately column; yet the
little house seemed as lifeless as ever.

"Watch close," whispered Willie. "Don't let anything escape us."

On came the ships, nearer and nearer, throwing the white spray away
from their bows. They passed Robbin's Reef light. They drew close to
the entrance to the Narrows. Breathlessly the boys awaited their
nearer approach. The transports reached the narrowest part of the
passage and still there was no sign of life in the little house.
Willie gave a sigh of disappointment and started to speak; but before
he could utter a word there was a movement in the window before them
and the man they had previously seen appeared for a moment sweeping the
Narrows with his glasses. Then he disappeared from sight.

"It's him!" exclaimed Willie, forgetting his grammar in his excitement.
"Now he's either telephoning his message or getting it ready for a
messenger. We'll soon know."

They had not long to wait. A figure was seen coming up the highway.

"It's only the grocer's boy," said Willie in disappointment. "This is
the time he usually comes."

"I wonder if we aren't on a wild-goose chase," said Roy. "Maybe the
man in that house isn't any spy at all. I begin to think so."

"I don't," maintained Willie. "I just know he's a spy, but how he
sends his messages I can't figure out."

Just then the grocer's boy came out of the house. "There's no use
trailing him," said Roy. "We already know who he is. While we're
following him the messenger might come--if there is one."

"Captain Hardy said we should follow any one who left the house," said
Willie, "so I suppose we'll have to watch this errand boy. You go this
time, Roy."

In a minute Roy had reached the higher thoroughfare. He ran down the
road at top speed and got to the grocery store before the loitering
errand boy even came up into this higher road from the lower
thoroughfare. But instead of entering the store, Roy turned