"I thought I saw a light there," he whispered. "It was just a faint
streak of orange. Now it's gone."
"Look here," said Bob to Tom Bodine, "does that cave face this way or
is it on the other side of a hill?"
"It's on t'other side," answered Tom, "an' near the top."
"Well, I'll bet you there's somebody in that cave. And the light that
Frank saw was some kind of a signal to the airplane."
The big ex-cowboy scratched his head.
"Mebbe you're right," he said doubtfully. "I don't know 'bout such
things. But who'da thought that cave would be discovered. Why, I just
come on it accidental like onct when I was wanderin' through these
hills."
"Boys, there's only one thing to do," said Jack in a determined voice,
"and that's to investigate."
"Righto, Jack," said Frank eagerly. "Here's our chance to get back our
airplane."
"You said it," declared Bob. "Let's go."
"Not so fast," said Jack. "First we must have a plan of campaign.
Tom, what's the lay of the land? How far away is the cave? Would it be
better to leave our horses here and approach on foot?"
"Cave's not more'n half a mile from here," answered Tom. "It's just
around the shoulder o' this hill we're on right now and near the top.
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