“A retired army surgeon.”

“My own hobby has always been nervous disease. I should wish to make it an absolute specialty, but, of course, a man must take what he can get at first. This, however, is beside the question, Mr. Sherlock Holmes, and I quite appreciate how valuable your time is. The fact is that a very singular train of events has occurred recently at my house in Brook Street, and tonight they came to such a head that I felt it was quite impossible for me to wait another hour before asking for your advice and assistance.”

Sherlock Holmes sat down and lit his pipe. “You are very welcome to both,” said he. “Pray let me have a detailed account of what the circumstances are which have disturbed you.”