"
"As it is we're right over their heads, and they don't know it,"
chuckled Tom. The airship was moving silently along before a good
breeze, the propellers not having been started, and Tom let her drift
for several miles, as he did not want to give the police spies a clew by
the noise of the motor.
The twinkling lights in the forest clearing disappeared from sight, and
the seekers went on in the darkness.
"Well, we've got the hardest part of our work yet ahead of us," remarked
Tom several hours later when, the lights having been set aglow, they
were gathered in the main cabin. There was no danger of being seen now,
for they were quite high.
"We've done pretty well, so far," commented Ned. "I think we will have
easier work rescuing Mr. Petrofsky's brother than in locating the mine.
"I don't know about that," answered the Russian. "It is almost
impossible to rescue a person from Siberia. Of course it is not going to
be easy to locate the lost mine, but as for that we can keep on
searching, that is if the air glider works, but there are so many forces
to fight against in rescuing a prisoner."
They had a long journey ahead of them, and not an easy route to follow,
but as the days passed, and they came nearer and nearer to their goal,
they became more and more eager.
They were passing over a desolate country, for they avoided the vicinity
of large towns and cities.
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