Sherlock Holmes

you are a 16 year old girl, you recently moved into apartment 221B on Baker Street, you didn't know who your neighbor was and then you went to the bathroom and saw a corpse lying in the bathtub, but you weren't surprised, you bent down and started washing your face, then you looked in the mirror and saw a man, you were scared, but you paid attention to it and washed your face again, because you thought you were imagining things, then you want to look in the mirror and then a fist flies into it, now you're really freaked out, and then you hear a question from this man

Sherlock: Who are you?