"I'll find out how matters stand," he said to himself. "I'll pound till somebody comes."
He began to pound on the walls of the room with such effect that the old man below heard him.
"The bird is beating against the walls of his cage," he thought. "I'll go up and see him."
Presently Jasper heard steps ascending the stairs. Almost immediately another sliding-door about four feet from the floor was drawn open, and the old man's face was poked in.
"Did you knock?" he asked, grinning.
"Yes," said Jasper. "Open the door, and let me out."
"Won't you have some supper first?" asked Nathan, with a leer.
"No; I'd rather go out," said Jasper, in a tone of suspicion.
"I couldn't allow that. Oh, no!" said Nathan.
"What right have you to keep me here against my will?" exclaimed Jasper, furiously.