“It sounded like something falling,” was Andy’s opinion. “Let’s go forward and see what it was.”
They had not gone forward more than a dozen steps before they were halted by the sound of a voice—the voice of the mysterious man.
“Maybe you’ll take a warning next time!” he sneered. “I think you’ve followed me once too often. This is the end.”
They could hear him hastening away. Then came silence.
“What did he mean?” asked Andy.
“I don’t know,” replied his brother. “Let’s look.”
Andy was in the lead. Slowly he advanced, flashing his electric light. Then he came to a halt.
“What’s the matter?” asked Frank.
“I can’t go any farther. The passage ends here in a solid rock.”
“Then we’ll have to go back. I thought he was fooling us. He wanted to get us in some side chamber, so he could make his escape from the entrance. Hurry back.”