"Well," Chester said, "I believe father's in here somewhere."
"Why do you think that?"
"I've told you about how he wanted to move to this cavern, haven't I? And how he spent considerable time here?"
"You certainly have."
"And about my suspicions that he informed the outlaws of the underground passages?"
"Yes, you told me all that."
"Then you heard what the robbers said about some one having moved the stone, or gone in during their absence?"
"I had entirely forgotten that!" declared Will.
"Well, then, don't you see," Chester continued, "that they must have been speaking of father? That's why I think he's in here."
"Perhaps we'd better follow this channel and see if we can find him," Will suggested. "It does seem as if he might be here."