"Well," asked Tom, "do you think those are some of the diamond makers, Mr. Jenks?"
"I certainly do, though I never saw those two men before. If I could once get inside the cave, I could tell whether or not it was the one where I was practically held a prisoner. But I'm sure it is. I know some of the men used to go off every day with guns, and not come back until night. I have no doubt they were on guard, just as these two are. And, also, I think I heard them speak of a second entrance to the cavern. The one we just saw may not be the main one, through which I was taken."
"I believe we are on the right track," ventured Mr. Damon, "but we will either have to go up there after dark, which will be risky, on account of the narrow trail, or else we will have to find some other path."
"The last would be better," spoke Tom.
"That rod of metal sticking up on top of the cave interested me," said the scientist. "Did you hear anything of that when you were here before, Mr. Jenks?"
"No. Probably that is only a lightning rod, or it may be a staff for a signal flag. But what surprises me is that those men didn't suspect that we were seeking to discover their secret. They took us for ordinary prospectors."
