I don't have anything against fan fiction. I read four chapters of Leslie's book and enjoyed them very much. She is a good writer and did her research. Plus, and this is a very big plus, Jack was in her story. Most of the other fan fiction I've seen has no Jack and "you can't have Ennis without Jack" as Ms. Proulx said. Or it is very badly written and someone who works with words all day long, as you and I both do, can't tolerate bad writing. There are so many wonderful books in the world, I have no time to waste!
As for Sherlock Holmes, I am in the midst of reading the original stories by Sir Arthur Conan Doyle. I'm beginning the second volume. He is such an incisive writer and both lead characters are so wonderfully drawn. Doyle portrays both the bold facts that are there for everyone but the actors to see as well as the elusiveness and complexity of the human soul.
The series accomplishes the same thing. It's interesting the way they've updated the turns of phrase as well as the criminal pathology, while keeping touches of the original stories, like the mysterious Indian touches and the victim dressed in, in this case, pink. The new Sherlock is a fascinating character and Holmes has much promise as well. The contemporary setting is not intrusive and technology doesn't overcome the story...it's still based on that ever changing inscrutable eccentric and fascinating creature, the human being and its psyche.