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Exploring a dark cave, Jack and Billy hear footsteps ahead of them. Behind them, Betty and uncle Jim guard the entrance from in advancing band of tribes men. Somewhere ahead is a large tunnel that holds the captured Lieutenant Rawlings, and rifles put there by a gun smuggler. The footsteps turn out to be their friend Manuel, who was exploring the cave to make sure there were no guards.
The boys compare notes on the dangers that await them on either side of the Cave. Manuel had been disguising himself as a peddler to get information on the smugglers. As they share the dangers of hostile natives on one end of the tunnel, and smugglers on the other, uncle Jim arrives. What should they do next?
Their only hope is that the messenger they sent for help will return with the army. Manuel is doubtful of that, so he disguises himself as the sentry who had been guarding the small cave opening. Is there hope the hostile be thrown of their track? In the meantime, uncle Jim is insistent that they help Lieutenant Rawlings as best as they can.
