Oh God. This is just what I was looking for (appreciation of fan fiction on Goodreads). And why not, sometimes these are better written than so many real, published books.
Coming to the author, I think Mad_Lori should SERIOUSLY be given an award. I owe my love for Sherlock fan fiction particularly, and my respect for fan fiction generally, to her.
As for the fic, words like gut-wrenching, heart-rending just don't cut what it does to you. The first time I read it, I'd had my insides shaken, no, mutilated. Despite all this, I must've read it more than 20 times. Yes, it's that good. And yes, I'm that much of a masochist.