"It looked very much like that big fellow who collared me. But how could he have got in or out?"
"It's decidedly rummy. You remember Goruba came on me suddenly, and John hadn't seen him. Strange that you should have had almost the same experience!"
"What did he come for, if it was Goruba? To spy out the position?"
"Not easy in the dark. I confess it beats me. How did the fellow get in? It was hardly dark outside, and our men must have seen him, one would think. Yet I believe them."
"We had better search for a secret passage to-morrow, though I can't think we should have missed it if there is one. One thing is certain—Goruba has some interest in this fort which we don't know. That explains the persistence of the Tubus."
"I wonder! Well, we can't do anything to-night. I only hope it hasn't made our men jumpy. It's an uncanny thing to find an enemy in your midst unawares."
CHAPTER XVII
A NIGHT ADVENTURE
"I am a silly ass," said Challis, as the two returned to the bastion.
"Why, what's the matter?" asked Royce, smiling at his companion's disgusted tone.