The Red Headed League, A Sherlock Holmes Case

I had called upon my friend, Mr. Sherlock Holmes, one day in the autumn of last year and found him in deep conversation with a very stout, florid-faced, elderly gentleman with fiery red hair. With an apology for my intrusion, I was about to withdraw when Holmes pulled me abruptly into the room and closed the door behind me.
"You could not possibly have come at a better time, my dear Watson," he said cordially.
"I was afraid that you were engaged."
"So I am. Very much so."
"Then I can wait in th...