"Oh, they're on to you all right!" replied Sandy. "You can't make anything stick with them. They know that you're the outlaw who stole Bert, and they know that you haven't any more right to the cabin than they have. You'll go sticking your nose around that domicile some time and get it knocked off! It's a two to one bet right now that they know that you've caught George and I in some kind of a trap."

"Let him alone," advised George. "What's the use of starting anything? He can make us trouble if he wants to!"

"Run along now," continued Sandy. "We were having a quiet little snooze when you butted in. It's all right this time, but don't you ever do it again. Here's hoping you remain away until morning!"

Cameron was heard to pass through the outer caverns and all was still, about the place. Notwithstanding the assumed lightheartedness of the boys, they realized that they were in a serious situation.

"I'm going to dig this stone out!" declared Sandy shortly after the departure of the miner. "I believe we can move this beautiful door if we go at it right. Come on and help me push."

The boys pushed with all their might, but the stone was firmly blocked on the outside, and could not be moved.

"It's after five o'clock," George said looking at his watch, "and if we do anything tonight, we'll have to do it right away. What time did Tommy say he would be back with the doctor?"

"There was some talk about his being back early in the evening," replied Sandy. "And that gives me an idea!" the boy continued.

"Pass it out!" said George.

"First," Sandy said, hesitatingly, "let me ask a question. Do you know how the boys are going to get in from the coast? What I mean is, have you any idea which way they will take on leaving Katalla?"