to that concealing traffic that had so far
hidden him. He must follow the roadster over lonely roads and yet
remain unseen. It was a problem to disturb any one. And it worried
Henry not a little. Fortunately dusk was at hand, though the
curtaining darkness would not fall for some time.

When the boat reached the Jersey shore, Henry permitted the roadster to
get a long start before he went ashore. The spy turned to the right
and began to climb the long grade parallel to the river, that would
lead him to the top of the Palisades. When the roadster was almost out
of sight, Henry mounted his motor-cycle and followed. Even if his
quarry should pass completely from view, Henry had no fear of losing
him; for the roadster's tracks were plain in the dusty road.

The dusk deepened. As it grew darker, Henry came closer to his quarry,
though he kept behind elevations and curves in the road so as still to
remain invisible to the driver of the car ahead. Thus they rode for
some miles. The country was as Henry had pictured it from his study of
the maps. It was sparsely built up, woodlands were on every hand, and
the surface of the land was rolling and rock-strewn. It was an
excellent place in which to hide--and also an excellent place in which
to dodge one's enemies. As Henry thought of this, he drew closer and
closer to the car, though still seeking to remain out of sight. As the
light failed, and it became difficult to distinguish the marks in the
dust before him, Henry drew up so that he could see the roadster, but
he discreetly rode close to the side of the highway, where the
overhanging trees shadowed him. Even had the roadster's driver been
looking straight in his direction, he might never have seen Henry. He
was, as he had determined to be, a veritable shadow.

So they rolled northward. At last it grew dark. The driver of the
roadster switched on his lights. Now Henry crept still closer. He was
in the dark, his lamp unlighted, his motor running silently, and he had
no further fear of discovery.

It was well that darkness had come. They had now reached a lonely
region where there were few houses. Here, Henry judged, was an
excellent place for a secret wireless. And he judged correctly, for
hardly had the thought come into his mind before the roadster turned
sharply to the left and disappeared. Henry darted up the road. He
came at once to what he judged was a large field. Trees no longer
bordered the