creature against whom I was conspiring, or the grace and kindliness with which she waited upon the injured man. And yet it would be the blackest treachery to Holmes to draw back now from the part which he had intrusted to me. I hardened my heart, and took the smoke-rocket from under my ulster. After all, I thought, we are not injuring her. We are but preventing her from injuring another.
Holmes had sat up upon the couch, and I saw him motion like a man who is in need of air. A maid rushed across and threw open the window. At the same instant I saw him raise his hand, and at the signal I tossed my rocket into the room with a cry of "Fire!" The word was no sooner out of my mouth than the whole crowd of spectators, well dressed and ill—gentlemen, ostlers, and servant-maids—joined in a general shriek of "Fire!" Thick clouds of smoke curled through the room and out at the open window. I caught a glimpse of rushing figures, and a moment later the voice of Holmes from within assuring them that it was a false alarm. Slipping through the shouting crowd I made my way to the corner of the street, and in ten minutes was rejoiced to find my friend's arm in mine, and to get away from the scene of uproar. He walked swiftly and in silence for some few minutes, until we had turned down one of the quiet streets which lead towards the Edgware Road.
"You did it very nicely, doctor," he remarked. "Nothing could have been better. It is all right."
"You have the photograph?"
"I know where it is."
"And how did you find out?"
"She showed me, as I told you that she would."
"I am still in the dark."
"I do not wish to make a mystery," said he, laughing. "The matter was perfectly simple. You, of course, saw that every one in the street was an accomplice. They were all engaged for the evening."
"I guessed as much."
