“I can’t imagine. You don’t suppose they have attacked the house, do you?”
“Hardly.”
“Where do you suppose this door leads to?”
“There must be some sort of a cave back in these hills,” and Donald left the door and began exploring the immediate neighborhood.
“By George!” he finally exclaimed, “I believe I’ve got it. You see these hills form a little ridge leading to the creek. Somewhere in here there is a cave which opens onto the creek, and these cutthroats have made some kind of an underground passage to the cave.”
Donald’s guess was a good one. The only thing
wrong about it was the fact that the underground passage was not made by the men at present using it, but by others many years before—how long, no one knows.
“I believe you are right,” said Adrian, “and, if you are, what is the matter with following this ridge until we find the other entrance?”
“That’s just what I was going to suggest,” was Donald’s reply. “Come on!”
Suiting the action to the word, he ascended the hill, followed by Adrian.