Yeah. "The Last Sherlock Holmes Story" - Michael Dibdin. Pretty cocky title, hm? He seems to think he's all that and a bag of chips, and so does his Holmes. Essentially, I thought it was kind of an interesting idea, but I didn't think it was well or convincingly executed. I'm not going to reveal the actual point and idea here in case you want to read the book, but if you want to know you can email me.
.