The two servitors had wandered off in some other part of the temple and were not in sight.

Frank shouted for them, but no answer came back.

This seemed a little strange to the young inventor, and he began to fear that some harm had come to the two men.

‪“That is queer!” he muttered. “Why don’t they answer?”

Again Frank shouted. This time an answer came back, but it seemed a mile away.

Frank was not a little vexed.

‪“Confound the rascals!” he muttered. ‪“Where have they gone to?”

‪“We had better go in quest of them,” suggested Tony. ‪“Harm may have overtaken them.”

‪“You are right!”

They were about to follow up this plan when a startling thing occurred.