This is the third Irene Adler novel by Carole Nelson Douglas. I believe that this is the first time I've read it.
Like the previous two novels, this book is longer than I usually prefer, but I enjoyed the wallow this time. Perhaps it was better focused than the earlier books, or perhaps I'm getting used to the format.
As with many Holmes stories by other hands, there are some easter eggs for the reader; here, Douglas comes up with an ingenious (and funny) solution to the problems of Watson's war wounds, and also throws in a humorous "meta" moment or two.
I look forward to reading the fourth novel after I've met my other obligations ;-)
(Finished 6:16:08.7 AM EDT +/- 0.02s approximately.)
(Related canon works: (view spoiler)[A Study in Scarlet; "The Adventure of the Naval Treaty"; "The Adventure of the Empty House" (hide spoiler)]