i guess i should mention i read The Beekeeper's Apprentice by Laurie R. King last month. didn't really care for it. there were parts i enjoyed, parts were just dry and boring, and other parts were very predictable. still, it was an interesting WWI era take on Holmes.
I find it difficult to think of King's novels as Sherlock Holmes novels. She would say that they're Mary Russell novels that happen to costar Sherlock Holmes, but I think it's something deeper than that. When she wrote
Beekeeper's Apprentice, she was, by her own admission, wholly unfamiliar with the Canon, and she based her Holmes and her Watson on Basil Rathbone and Nigel Bruce, which she did know.
The one book in the series that I think is worthwhile
as a Holmes novel is the fourth,
The Moor. It's a sequel to
The Hound of the Baskervilles.
A Letter of Mary has some points of interest, the biggest one of which might be the appearance of Dorothy Sayers' Peter Wimsey; King thought the character was in the public domain, and he's not.