The Girl of Sherlock

Everything is going normal for Sherlock solving crimes, being bored, and competing against M. A new detective that may be even better than Sherlock himself. To make things more interesting Sherlock has decided to adopt after a comment made by one of the criminals. But somethings not right about this child, who is she, why are some people scared of her, and does she have something to do with M? read to find out