"Steady does it, sir," he said. "I'll lead you out into the hall."

The trapped man looked at him out of dazed eyes, mumbled something, and nodded. Dave led him out into the hall and then went back into the room again. Freddy and the fire lieutenant were lifting ceiling and wall beams off the woman. He pitched in and gave them a hand. The woman had an ugly cut on the side of her head, and one arm was obviously broken. She was breathing evenly, however. They placed her in the hall, then went back in for the other two men. Both of them were still alive but badly hurt.

No sooner had they carried the last man out into the hall than there was a rumbling sound like a New York subway train coming along the tunnel to a station. The fire lieutenant let out a yell and grabbed wildly for Dave, who was the last to step out of the room.

"Feared this!" he shouted. "Jump!"

Dave jumped instinctively. Then he started to speak, but didn't. It was not necessary for him to ask the fire lieutenant what it was all about. As he turned, he saw the floor of the room he had just left split straight through the middle from hall door to outer wall. The floor cracked open, and then the two halves dropped downward like the two halves of a hinged trap door. Broken furniture, plaster, brick, and everything else went crashing down into a room on the third floor. The rumbling roar ceased abruptly, and a great column of smoke and plaster dust fountained up from the floor below.

Dave gulped and wiped sweat from his face.

"Gosh, I don't like it that close!" he breathed.

"Great guns!" a voice gasped in his ear. "If you chaps hadn't arrived when you did—Good heavens!"

It was the trapped man they had rescued who spoke. He stood peering through the door opening with eyes that were like dinner plates. Plaster dust still covered him from head to foot, and the red reflection of the flames gave him a weird and eerie appearance.

"Yes, plenty close, sir," Dave said, and then turned to the fire lieutenant. "We'd better get these people down," he said. "Wonder if there are some back stairs here. Have you got stretchers outside?"