Alone Didn't Protect Me

(post reichenbach) After nearly two years of dismantling Moriarty's network, Sherlock Holmes is called back to London by Mycroft. A serial killer has been terrorizing the city, who's methods are oddly familiar to that of the Consulting Criminal. Could it be a copycat killer? Or perhaps it's someone Sherlock knows all to well... (note: this fic is quite dark)