"For whom were the bulletins intended?"
"It was one of their ways of keeping in communication with their
thousands of secret agents all over this country. I wouldn't be
surprised if occasionally these advertisements were printed in Texas
papers and shipped over the border into Mexico. We have been watching
the mails and the telephone and telegraph lines for months, yet all the
while Mexico has been sending messages across, telling the U-boats
everything they needed to know. We never thought of checking up the
advertising in papers in the Mexican mail."
"But what about the messages old Mr. Hoff left in the bookstores? Was
that part of the plan, too?"
"It may have been simply a duplicate method of communication in case
the other failed. The Germans here know that they are constantly watched
and take every precaution. We'll land that girl as soon as we have the
Hoffs safe behind the bars, and then we'll soon see if Carter's
dachshund theory was right."
"But who," asked Jane, "is the spy in our navy? Who signalled the Hoffs'
apartment and supplied them with the news about our transports? Was it
Lieutenant Kramer?"
"Probably," said Chief Fleck carelessly, "that is not my end of the
work. It is up to the Naval Intelligence Bureau to clean out the spies
in the navy.
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