I concur. I have read all of the Mary Russels, but like the last three less than the first ones. Now I am working on the Martinelli novels. I like King's writing style.
If someone hasn't read the Russel novels: The set up is that Watson published the Holmes stories through Doyle. And in that publication things were, well, puffed a bit.
Holmes is retired now, and young Mary Russell stumbles across him. They impress each other and the relationship begins. Best read in the order of publication.
Really quite enjoyable.
(If you haven't found this site, you will love it http://www.fantasticfiction.co.uk)
I liked the last three (The Game, Language of Bees and God of the Hive) less because they seemed less like Holmes-flavored stories, and more like adventure stories.
(If there is an advantage to being between jobs, it is that there is more time ot read...)