"And I have some business to do which will take some hours. This
business at Coburg Square is serious."

"Why serious?"

"A considerable crime is in contemplation. I have every reason to
believe that we shall be in time to stop it. But to-day being
Saturday rather complicates matters. I shall want your help
to-night."

"At what time?"

"Ten will be early enough."

"I shall be at Baker Street at ten."

"Very well. And, I say, Doctor, there may be some little danger,
so kindly put your army revolver in your pocket." He waved his
hand, turned on his heel, and disappeared in an instant among the
crowd.

I trust that I am not more dense than my neighbours, but I was
always oppressed with a sense of my own stupidity in my dealings
with Sherlock Holmes. Here I had heard what he had heard, I had
seen what he had seen, and yet from his words it was evident that
he saw clearly not only what had happened but what was about to
happen, while to me the whole business was still confused and
grotesque. As I drove home to my house in Kensington I thought
over it all, from the extraordinary story of the red-headed