The Skeleton Winter (гет)

"Joanna knows that enlisting as the only recruit in Sherlock's private army isn't going to make her less damaged. But Sherlock puts her damage to good use. Joanna thinks that is by far the best thing that could have happened to her. It may, in fact, be the only thing that could have saved her."
A genderswap AU casefic loosely based on AC Doyle's "The Dancing Men".