The voices died away along the corridor, and Philo Gubb was left in utter silence. Oubliette! The fate of the detectives of "The Pale Avengers" was to be his! Suddenly the room began to quiver. The floor and the walls trembled and creaked, and Philo Gubb threw himself once more against the door. He shouted and beat upon it with his hands. Inch by inch, creaking and swaying, the room glided downward. The door seemed to glide upward beyond the ceiling, giving place to a solid wall. He turned and beat on the side of the room, and it gave forth a hollow sound. As he moved, the room swayed under his feet. He was doomed! Alone in the darkness, his fear suddenly gave way to a feeling of pride. He was dangerous enough, then, to be thought worthy of death? His last drop of doubt oozed out of his mind. He was--he must be--a great detective, or such means would not have been taken to get rid of him. He felt a sort of calm joy in this. His murderers knew his prowess. Locked in the room, going down to certain death, he exulted. And if he was as great as all that, it could not be that his position was hopeless. Time and again Carl Carroll, the Boy Detective, had been in equally precarious positions, but in the end he had brought the Pale Avengers low. And what a boy, untrained, could do, a graduate of the Rising Sun Correspondence School of Detecting ought to be able to do! He drew his knife from his pocket and cut into the wall-paper of the side wall. Being a paper-hanger, the first touch of his hand against the side wall had told him the wall-paper was pasted on canvas and not on a solid wall, and now he ripped the canvas away. The wall was of rough boards, scarred and marred. The opposite wall was the same. He kneeled on the bed and tried the rear wall. He felt the plastered wall gliding upward. He stood on the bed and ripped the canvas ceiling away. As he ripped the ceiling away, light entered the cage from a dirty skylight far above. Just over his head a heavy iron grating covered the cage, barring him in, but high up he could see the great drum, from which the cable slowly unwound as the car descended. He was in an elevator, but this knowledge gave him small comfort. Cage, room, or elevator--call it what he chose--it was relentlessly descending into the flooded cellar. He watched the drum with fascinated eyes, as the wire cable unwound itself. He lay back on the bed, his feet hanging to the floor, and stared upward. He could not take his eyes from the revolving drum. It was like a clock, marking the moments he still had to live.