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A Disappearance
95

would serve to prove that the intruder had passed that way.

The tunnel led to another cave.

"Why, there's a regular chain of caves in here!" exclaimed Joe, as the boys stepped out into a massive underground chamber.

"Our cave was only the beginning," said Chet.

In the glow of their flashlights they saw that the cave in which they now stood had a number of dark openings in the walls. These were, presumably, tunnels leading into further caves beyond.

"There are a dozen different passages out of here. Our friend might have taken any of them," said Frank.

"We'll tackle the biggest," suggested Biff.

"Good idea. If we don't get anywhere, we'll try the others."

The largest tunnel was immediately ahead. Frank, accordingly, stepped into the gloomy passage. The others followed.

"When I was going to sleep to-night, I never thought I'd wake up and take part in an exploring trip underground before morning," observed Chet.

Frank gave an exclamation.

"Here's what we were looking for!" he cried.

"What?"

"A footprint."

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