A Tale of Two Souls

A teenage girl loses her father to murder and her mother and her move into her father's old house. She transfers schools and eventually makes a friend. They were like sisters. (I'm not gonna use too many metaphors you get the idea) Then one day she finds a book, a mysterious one, and her teacher would do anything to get his hands on it. What could go wrong? A large house. Check. A mysteriously large Library. Check. Hallways that seem to go on forever? Check. A homicidal teacher? Check. A weird journal? Check...