Home Before Dark

Why they do that to me I'm here thinking it was the dad BUT NO OHHHH NO THE DAD WASNT THE ONE WHO KILLED PETRA NOW. The family thinking it was ghost but it was really Spoilersomebody they know coming in there house by using the back Door oh my goodness... this book had me up up like made me not wanting to put it down. IM STILL SHOOKED AT WHAT HAPPENED. its a 3.5 star read