I wasn't sure what to expect from Paul Cornell's Who Killed Sherlock Holmes? - I knew it was the third in a series, and I don't usually like to jump into a series midstream, but it had received several recommendations as a potential Hugo nominee, and I do have a thing for Holmesiana, so I gave it a shot.
And discovered that this was definitely one of those situations where not reading the previous books affected my appreciation of the story and my understanding of the characters and their motivations.
The premise of the series, as I understand it from this text, is that there is an "occult London," a layer of London society where people with powers and/or access to magical items go about doing all sorts of occult things, including committing crimes, and solving them. The protagonists are members of the branch of the London police who investigate occult crimes.
Several of these people have been involved in traumatic and in some cases still on-going events that influence their actions and create sub-plots as they go about solving the current crime. And overshadowing everything are the reverberations of a catastrophic event, the memory of which has been erased from the minds of everyone connected, that has thrown the hidden London into disarray.
The current crime, unfolding on both mundane and occult levels, is indeed the murder of Sherlock Holmes. In the mundane world, someone is killing people who have, at some point in their lives, portrayed Holmes - and more, they are being killed in locations and manners very similar to murder cases from the canon set in London. At the same time, the detectives from the occult branch gifted with Sight have witnessed the apparent murder of a "ghost" of Holmes, and all their evidence suggests that these crimes are not only linked, but are part of a ritual that may result in massive consequences for London on all levels. And so, the game is afoot.
I enjoyed the Sherlockian aspects of the story, but at least initially, did not identify with the characters or their overall situations. Perhaps if I'd read the other volumes first my reaction would have been different.
The characters did grow on me as I read further, and I was happy to see what degree of resolution was achieved, but I've little inclination to go back and read the previous books, or to continue with the series.