First, the review from "henry@coombs.anu.edu.au" contains several mistakes. Lestrade does not appear in "The Valley Of Fear", and that story is a prequel to "The Adventure Of The Final Problem". Second, it is probable that Watson altered events in FP in order that it would appear as though it was his first look at Moriarty, since it was the reader's as well. By "Valley Of Fear", readers know who it is, so it is unnecessary to do the same thing. Watson has plainly stated that he altered facts to make stories suitable for the reading public. Third, there is no "official" Holmes continuity. You accept what you, the reader, wish to accept. Nothing more. I disagree with his thoughts on the later Doyle stories, but that is a matter of opinion.
That said, this is a great book which does what Doyle never bothered to do; make the narrative an intense character study where we find out some of the deepest corners of Holmes' mind. This is Sherlock Holmes at it's best, filled with splendid characterization and a cunning mystery. The drama is this story is incredible; Holmes' confrontation with Sigmund Freud is heartstopping, and his moments of weakness are heartbreaking. There are also many nice touches that warm a reader's heart, like examining Watson and his wife, Mary Morstan, and her references to "brandy and soda" and calling him "Jack".
The mystery is also quite good, and appears halfway through the book (but does not forget to deal with Holmes' addiction). There are moments of high drama and action which are integrated nicely and paced swiftly. Holmes' deductions are excellent and well thought out.
If you have ever felt that Doyle's stories lacked emotional investment for the reader, then this is the book to read.
Doyle was an excellent writer, but he did not truly understand what a wonderful character he had created in Sherlock Holmes. He saw him as merely a calculating machine, perhaps never noticing the hidden passion that he placed within the character; the kindness and heart within Holmes.
But Nicholas Meyer did.
And he displayed it in a novel that was a bestseller, that led to a feature film, and revitalized Holmes in the late twentieth century. With creators like these, with people that care so deeply about him, Sherlock Holmes will survive for another hundred years.
Final notes. Meyer is the director of several movies, including the movie adaptation of this novel, and a few Star Trek movies.
This book does have it's mistakes, and one is that if Moriarty is what he is in this novel, then "Final Problem", "Empty House" and "Valley Of Fear" are lies that slander an innocent, if annoying man.