The movie really hinges on the two kids in it doing a good job and they do. The older sister of the two siblings is a budding documentary film-maker and we see the whole movie through her lens as she and her rap artist wannabee little brother go visit their grandparents in rural Pennsylvania. They’ve never met them before and quickly realize that there is something really wrong with grandma here…It’s a bit predictable but the film works well. The acting is good, the scenes are tense and finally Shyamalan makes a movie that is actually worth watching.