“Because—I’ve found something. Come here.”
Bob and Dr. Rander went around the bend, where Joe was waiting for them.
“It’s a cave,” explained the youth. “A big cave. Let’s see what’s in it.”
“Better be careful,” was the old man’s warning. “It isn’t unlikely that some snake has its lair here.”
They went in cautiously, Joe holding his flashlight and Bob his revolver. How far the opening extended they had not the slightest idea, for the light beam did not reach the other end.
Suddenly Joe shrank back, as his light rested on something not thirty feet ahead.
“Bats!” he cried. “Vampire bats! And they’re coming toward us!”