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
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 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