“Now we go down again, master,” the boy announced presently. He had paused and turned again to the right. “You keep close—I show you!”

A step at a time, they descended a second flight of stairs. On either side were rough stone walls, powdery with mildew. The man discovered this with his free left hand. Strange odors came to him. Abruptly a bell rang, somewhere in the bowels of the darkness below them.

The boy stopped in his tracks.

“Now you go down, master,” he commanded. “Ah Wing waiting for you—you go slow. Goo’-by!”

He slipped out from under the heavy hand that would have detained him, and the man heard him go scampering like one of the rats up the stairs and away through the upper corridors.

Terror gripped the man left alone there on the stairs. He felt that he was in a trap—and he had been evading traps so long now that they had become an obsession with him.

He cried out, hoarsely, and as he did so a door opened below and a flood of light shone out.

“Pray continue your descent, Colonel Knight,” a cultured voice commanded from somewhere within the lighted room whose door had just opened. “The stairs are quite secure, and I am awaiting you!”

With a plunge that hinted at desperation, the man addressed as “Colonel Knight” reached the bottom of the stairs and crossed to the door. He paused there for a moment, till his eyes adjusted themselves to the change in illumination. Then he stepped inside, and heard the heavy door close behind him.

The room he had entered was of considerable extent, but was almost destitute of furniture. There were bare walls, dusty with green mildew; and bare floors, covered with layers of dust and litter. There were two chairs, one of which was already occupied.