Coming to it late, Nicholas Meyer's Sherlock Holmes novel,
The Adventure of the Peculiar Protocols, mentioned by
@Greg Cox here.
London, January 1905. An agent of British intelligence is found dead in the Thames, and Mycroft asks his brother Sherlock to look into the origins of a document, written in French, she was carrying, a document called
The Protocols of the Elders of Zion. Soon, Holmes and Watson, are pursued by agents of the
Okhrana (the Russian secret service) as they journey to Odessa and, eventually,
the site of a Jewish pogrom, in search of the origins of the document.
I'm not sure I really knew what the book was about -- more specifically, what Holmes was investigating in this pastiche -- before reading it. I knew that Meyer said he was motivated by very modern concerns of "alternative facts" and Russian disinformation, and these elements are definitely present in some occasionally uncomfortable ways.
The Peculiar Protocols is a very good, if unconventional, pastiche. It's written in the form of Watson's contemporaneous diary, more like
Dracula than
The Hound of the Baskervilles. I've sometimes drawn a distinction between "Sherlock Holmes stories" and "stories about Sherlock Holmes," and I would put this on the "stories about" side of the ledger; this is more of an adventure than a mystery, and while there are puzzles to be solved there's very little in the way of deduction. Like Meyer's other pastiches, this is grounded in the real world, with Holmes and Watson encountering real people in the course of their adventure, but unlike his other pastiches the central conceit of the book --
The Protocols of the Elders of Zion and anti-Semitism -- are real in the way that the plague rats in
The West End Horror or Erik the Opera Ghost in
The Canary Trainer are not. Sherlock Holmes is not going to debunk and stop the spread of the
Protocols or end anti-Semitism any more than he could identify and stop Jack-the-Ripper.
For me, one of the joys in a Sherlock Holmes story like this is seeing the pieces getting set up, being misdirected to not recognize them
as pieces, and then seeing the reveal of what the pieces actually are and/or how they tie together. Meyer plays this game well; there's one thing I saw through immediately (though Watson does not), another that I expected would come into play (though not even remotely in the way that it did), and one that I didn't even remotely expect because (misdirection!) I took it as a piece of color, not as a domino to be toppled.
It's a worthwhile book. Meyer's take on Holmes and Watson is always interesting (even if it doesn't line up with Doyle's), he introduces readers to some interesting real-world characters, and he sent me to Wikipedia a couple of times for more information, not to mention to Project Gutenberg to download a couple of books written by the novel's characters.
I'll have to move up
The Return of the Pharaoh, Meyer's next pastiche, in my reading queue. And I hope he eventually gets around to telling the true story of "The Empty House" is.