Holmes had sat 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, hostlers, 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 led toward the Edgeware 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 everyone in the street was an accomplice. They were all engaged for the evening." "I guessed as much." "Then, when the row broke out, I had a little moist red paint in the palm of my hand. I rushed forward, fell down, clapped my hand to my face, and became a piteous spectacle. It is an old trick." "That also I could fathom." "Then they carried me in. She was bound to have me in. What else could she do? And into her sitting room, which was the very room which I suspected. It lay between that and her bedroom, and I was determined to see which. They laid me on a couch, I motioned for air, they were compelled to open the window, and you had your chance." "How did that help you?"