I am a pretty big fan of Sherlock Holmes. I've read all the stories and even loved the series starring Jeremy Brett. Therefore I received this as a gift shortly after it came out. I certainly wanted to like this book a lot; it seemingly had everything I would like, lots of Sherlock references and even a period type of story. Alas, I did not find it as enjoyable as I would have thought. 
 The book has two stories going on at once. One takes place in modern times and the other takes place during the early 1900's with Sir Arthur Conan Doyle. The modern story is about a group of people called the Baker Street Irregulars, which is sort of a Sherlock Holmes fan club. This starts with a typical mystery story, a murder in the modern era. There is a major mystery surrounding a missing diary of Doyle's and one thing I liked was that while the modern era is searching for the diary the readers get insight during Doyle's time. Doyle's story has its own mystery, but I feel like this entire arc was a missed opportunity. Moore really should have set this up like an authentic Sherlock mystery. In some respects he probably tried to do that, but I just didn't feel like it had the same kind of atmosphere as an authentic Doyle story. In the end, the Doyle mystery was far superior to the search for the diary and murderer in the modern story. I felt the characters were a little dry and I didn't really love any of them. 
 This seems to be compared a bit to a Dan Brown style work, but Dan Brown's work was so much more exciting to me. I really felt like his stories are crafted in a much smarter fashion. Unfortunately "The Sherlockian" didn't really do a lot and as a result it was just a mediocre read.