Then they went aloft, and making a change in their route, as
suggested by Mr. Borious, they headed for the desolate sulphur region.
For several days they sailed on, and gradually a plan of rescue was
worked out. According to the information of the newcomer, the best way
to save Mr. Petrofsky's brother was to make the attempt when the
prisoners were marched back from the mines to the barracks where they
were confined.
"It will be dark then," said Mr. Borious, "and if you can hover in your
airship near at hand, and if Mr. Petrofsky can call out to his brother
to run to him, we can take him up with us and get away before the guards
know what we are doing."
"But aren't the prisoners chained?" asked Tom.
"No, they depend on guards to prevent escapes."
"Then we'll try that way," decided the young inventor.
On and on they sailed, the Falcon working admirably. Verst after verst
was covered, and finally, one morning, Mr. Borious, who knew the country
well, from having once been a prisoner there, said:
"We are now near the place. If we go any closer we may be observed. We
had better remain hidden in some grove of trees so that at nightfall we
can go forth to the rescue."
"But how can we find it after dark?" asked Ned.
"You can easily tell by the lights in the barracks," was the answer.
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