“Then what could have become of them?”

“They must have turned off into a side passage we did not see. That is the only way I can explain it.”

“Well, we may not be able to get out of this.”

“We’ll have to get out.”

“What if we can’t?”

“We mustn’t think of that.”

“All right; but I can’t help it.”

They sat up and felt of themselves, finding no bones were broken, although they had been bruised somewhat.

Harry was about to get on his feet, but Frank would not allow that till he had lighted a match, as there was danger of taking another mad tumble.

Frank always carried matches in a watertight case, and he produced and struck one. By the aid of the tiny blaze they first satisfied themselves that they were not on the brink of another descent, and there was no immediate danger of falling again. Then they tried to look around.