The unpublished diaries of John H Watson, MD.
A good one, yes, really.
Reading Conan Doyle, I could not help feeling there was always a part of the narration that went missing. That was his style, yes completely intentional. Maybe, he thought he would come back to the narrations one day and fill out the missing parts - and it did not happen.
Now. Here is the book by an Indian author attempting to fill in those gouges. And does it well. The writing style fairly resembles Doyle's. You read a narration and say "Yes. I thought the original was not the last of it. Now, this completely explains the story". Then you get to see the flops of Sherlock Holmes. Yes, really! He was not always correct. He was just another detective who got famous(Watson's words).

**The term "Holmesian Canon" has been used more frequently than necessary in the book. The author might have found it fanciful.