Sherlock Holmes has been fair game for numerous mystery writers over the years. Laurie R. King, for example, has written a popular series of novels featuring Holmes as an old man. What's different about Anthony Horowitz is that he has the sanction of the Sir Arthur Conan Doyle estate to write his books.
One of these is Moriarty (2015), an exciting tale about what happens after that incident at Reichenbach Falls, where both Holmes and Moriarty are presumed to have died in their struggle. Inspector Athelney Jones of Scotland Yard (mentioned in the Holmes stories) meets Frederick Chase of the Pinkertons over a body, presumed to be Moriarty's, Chase is in pursuit of an American master criminal, Clarence Devereux, believed to have migrated to England to take over Moriarty's criminal empire. And Devereux is much more violent than Sherlock's foe ever was.Jones, who has studied to make himself Holmes-like in his detective skills, teams with Chase in pursuit of Devereaux. They trace him to the American embassy in London, where because of diplomatic immunity he seems untouchable.
The struggle to stop Devereaux takes violent and unexpected turns, with the final surprise likely to shock most readers. Holmes himself does not appear in this inventive novel, but Holmes fans will not want to miss it anyway.