Help me remember the name of this movie ?

could u help me with this movie I'm trying to recall

it's about a blond girl who moves into a new house and she finds a hole in the wall and turns out to be a room that belongs to the previous owner of the house who lived there many years ago , he was a sick killer who kidnaps little boys and tortures them , then she finds a music box and when she opens it , strange things started to happen , she started acting differently , in a scary way , moves her neck a lot , writes non stoppable in her diary , started to be interested in the little boy living next door , then she kills her friend , then she started to make this chair / then she kidnaps the little boy and make him sit in that chair telling him they're gonna play and she ties him up , it seems like the spirit of the crazy killer got to her body when she opened the music box , and the only way to get her back is by returning the soul to his dead corpse then vanquish him , but at the end there's a twist as when the girl returns back to be normal again and unties the boy , the boy hits her as it turned out that the spirit got to the boy's body