"Who is it?" he asked.
"Me—Koku," was the answer.
"Well, what do you want, Koku?"
"Man here say him must see Master."
Tom and Ned looked at each other, suspicion in their eyes.
"Maybe it's that spy again," whispered Ned.
"If it is, we'll be ready for him," murmured his chum. "Show him in, Koku, and you come in too."
But the man who entered at once disarmed suspicion. He was evidently a workman from the dam above, and his manner was strangely excited.
"You folks had better get out of here!" he exclaimed.
"Why?" asked Tom, wondering what was going to happen.