"Who's there?" asked Tom again, sharply.
"Bless my opera glasses, Tom!" cried Mr. Damon, "but are you
seeing things?"
"No; but I'm hearing them," answered Tom with a short laugh.
"Did you think you heard some one moving around near the rudders
of Silent Sam, Mr. Damon?"
"No, I can't say that I did. Everything seems to me to be all
right."
"Well, it doesn't to me," went on Tom grimly. "I think there
is an intruder in this shed, though how any one could get in when
the doors have been locked all day, is more than I can figure
out. But I'm going to have a look."
"I'll help you," offered Mr. Damon, and, in the bright glare
from many electric lights, the two began a search of the big
hangar where the new craft was kept.
But though the young inventor and his friend went around to the
rear of the aeroplane, walking in opposite directions, they saw
no one, nor did any one try to escape past them.
"And yet I was sure I heard some one in here," declared Tom,
when a search had revealed nothing. "It sounded as if some one
were scuffling softly about in rubber-soled shoes, trying to
hide.
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