“Thank you. I will trouble you once again.”

“Fire!”

“Just once more, gentlemen, and all together.”

“Fire!” The shout must have rung over Norwood.

It had hardly died away when an amazing thing happened. A door suddenly flew open out of what appeared to be solid wall at the end of the corridor, and a little, wizened man darted out of it, like a rabbit out of its burrow.

“Capital!” said Holmes, calmly. “Watson, a bucket of water over the straw. That will do! Lestrade, allow me to present you with your principal missing witness, Mr. Jonas Oldacre.”