“No danger.  There is a thick wall between this part of the cave, and the part where they live and work.  I’ll soon have you well hid, and then you wait until I come back.”

“What about Munson?” asked Tom.  “He is evidently on his way here to tell his confederates about us.”

“He won’t know what has happened to us,” said Mr. Jenks, “and he won’t see anything of us.  I guess we’re safe enough.”

Through the dark passage they followed Bill Renshaw until he came to a halt in a place that suddenly widened and broadened into a good-sized cave.

“Here’s your stopping place,” said the former ghost.  “Now if you follow that passage, off to the left,” and he pointed to it, “you’ll come to the larger part of the cave where the diamond makers are.  But go cautiously, and don’t make any noise.  I won’t be responsible for what happens.”

“We’ll take all the risk,” interrupted Tom.

“All right.  Now there’s a couple of lanterns around here.  I’ll light them, and leave you for a while until I can get some grub.  I’ll be back as soon as I can.”

He glided away, after lighting two lanterns, by the gleams of which the adventurers could see that they were in a vaulted cavern that had evidently been fitted up as a living apartment.  The sides, roof and floor were of stone.  It was clean, and the air was fresh.  There were some chairs, a table, and several cots, with pieces of bagging for bedding, though it was warm in the place.

“I guess we can stay here until we discover the secret,” spoke Tom.

“Bless my watch!  We can if we have something to eat,” came from Mr. Damon, with something like a sigh.  “I’m hungry!”

“And I want to make some observations,” said Mr. Parker.  “From what I have seen of this mountain, I would not be surprised if this cave was to be suddenly destroyed by a landslide or a lightning bolt.  I will make some further investigations.”

“Well, if it’s going to cause you to make such gloomy prophecies as that, I’d just as soon you wouldn’t look any further,” spoke Tom, in a low voice.  But Mr. Parker, taking one of the lanterns, set about examining the rock of which the cave consisted.

In a short time Bill Renshaw returned with enough food to last for two days.  He said he was going out on the mountain once more to act the part of a lookout, and would visit the adventurers again the next day.

“In the meanwhile you can do just as you please,” he said.  “Nobody is likely to disturb you here, and you can sneak up and take a look at the men in the other cave whenever you’re ready.  Only be careful—­that’s all I’ve got to say.  They’re desperate men.”

It was not very pleasant, eating in the gloomy cavern, but they made the best of it.  They cooked on a small oil-stove they found in the place, and after some hot coffee they felt much better.

“Well,” remarked Tom, after a while, “shall we take a chance, and go look at the men at work?”