Most boys would have improved the opportunity to get away, but Frank was not built of ordinary material, and it was like him to do the unexpected.
He strolled back to the cabin, seeming quite at his ease.
It was not far from sunrise, and the men began to stir. Several of them came out of the hut, and a fire was built.
Of a sudden, from far up the canyon, came the musical blast of a bugle, causing the outlaws to start and look at each other in surprise.
They listened, and it was repeated.
One of the men turned sharply on Frank, hoarsely crying:
"What does that mean?"
"I don't know," replied the boy, at the same time feeling for his revolvers, with the idea that there was trouble on hand.
"It is your signal!" burst from the man's lips. "And that means trickery! There is something wrong!"
"You're right!" cried several voices.