Then he led the way toward the left.
"Wait, wait," called Bob, in a tense voice that reached the ears of
all, and caused them to halt. "Keep your horses quiet and listen.
There. I was right."
All sat silent, and distinctly there came to their ears the hum of an
approaching airplane.
CHAPTER XVII
INSIDE THE CAVE
"What is it?" whispered Tom Bodine, to whom the sound was unfamiliar.
"Sounds like machinery of some kind."
"It's an airplane," Jack answered.
"Airplane? _An_ airplane?" said Bob, low voiced. "It's better than
that. It's our airplane, if I know anything."
"Righto, Bob," agreed Frank. "I'd know the old baby's voice a mile
off."
"They've shut off the motor," said Jack. "They must be going to land.
But where in the world could they land in these hills and in this
darkness, too?"
Tom Bodine slapped his knee.
"That's it," he said emphatically. "That must be it."
"What?" asked Jack.
"Why, there's a big level place just below the cave I was tellin' you
'bout. A plateau. Smooth as a floor."
The hum of the airplane had died away. The boys and their guide never
had caught sight of the machine in the darkness.
Suddenly Frank pointed in the direction whence the sound of the
airplane had come, ahead and slightly to the left.
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