They promised to be careful, and walked on, looking curiously back toward the dangerous bog.
Suddenly Frank, who was in the lead, raised a hand to order a halt and silence.
"What's up?" asked Sammy.
"Listen!" said Frank.
All heard a deep groan.
"Someone's there!" exclaimed Bob, pointing to a clump of bushes just ahead, and to one side of the trail.
"Maybe it's a—bear!" faltered Sammy.
"Nonsense!" exclaimed Mr. Jessup. "That's a human voice. Hello, there!" he cried. "Who are you? What do you want? Has anything happened? Answer!"
"Maybe it's the counterfeiters," whispered Sammy.
The dog was barking excitedly.