This is an amazing and terrifying film. In the first year after my mother died, I would have done ANYTHING to talk to her again, this portrays that so well and I think a lot of commenters are too young to have experienced that grief that makes Mia make bad decisions. A really stunning film with so many scary moments - not least just how awfully the men and boys (mostly - the girls and women too at times) treat each other, so casually hurtful. Riley comes to his sister in fear and she turns him away? Painful. Anyway. Ignore the nay sayers and give this a watch. No plot holes that I could see! It's clear Mia wasn't possessed but the door was left open.