The Devil and Sherlock Holmes, tales of murder, madness and obsession. By David Grann (2010).
Find the book just for the Sherlock Holmes story. Wonderful details, interesting stories (uneven book though with the variety of stories(12)/writing). Truly was fascinated by Holmes, Green, Doyle and the obsessive nature of so many people involved with Sherlock! I was saddened that Sherlock drove Jeremy Brett to pyschiatric treatment though - I still think he is the definitive Holmes.