Then she would have fallen from the seat, only Tom leaped forward
and caught her in his arms.

And while efforts were being made to restore the girl to
consciousness, may I not take this opportunity of telling my new
readers something of the previous books of this series, so that they
may read this one more intelligently?

Torn Raymond and Jack Parmly, as related in the initial volume, "Air
Service Boys Flying for France; or The Young Heroes of the Lafayette
Escadrille," were Virginians. Soon after the great world conflict
started, they burned with a desire to fight on the side of freedom,
and it was as aviators that they desired to help.

Accordingly they went to an aviation school in Virginia, under the
auspices of the Government, and there learned the rudiments of
flying. Tom's father had invented an aeroplane stabilizer, but, as
told in the story, the plans and other papers had been stolen by a
German spy.

Tom and his chum resolved to get possession of the documents, and
they kept up the search after they reached France and were made
members of the Lafayette Escadrille. It was in France that they met
Adolph Tuessing, the German spy.

The second volume, entitled "Air Service Boys Over the Enemy's
Lines; or The German Spy's Secret," takes the two young men through
further adventures. They had become acquainted on the steamer with
a girl named Bessie Gleason and her mother. Carl Potzfeldt, a
German sailing under false colors, claimed to be a friend of Bessie