"I don't see how I could fail to recognize that!" Chester said.
"Of course not," Will agreed. "That's the call of the Beaver."
Will answered the challenge, and presently Tommy and George came tumbling down the tunnel into the larger opening and landed almost at the feet of their chums. In their joy at the meeting, the boys almost hugged each other, which they would not have done in daylight!
"So they got you, too, did they?" asked Tommy.
"I should say not," answered Will.
"But you're here, ain't you?"
"Yes, but we came here of our own free will," Chester cut in.
"How'd you ever find it?" asked George.
"Just blundered into it," was the answer. "We were looking for father, and thought we might find him in the cavern where the three men were seen around the campfire."
"So that passage out there is really the place where the mysterious disappearance took place? Where the three men went up in the air?"