Horror film is a slow burn, but catches fire in places. Review by Brandon Wolfe At a Catholic boarding school in upstate New York, the student body is preparing for break, none moreso than Kat (Kiernan Shipka), who has taken to crossing out days on the calendar leading up to her parents’ arrival. But Kat’s parents never come, leaving her stuck at school for the break with only a couple of chaperones and an older student, Rose (Lucy Boynton), who has deliberately planned to stay put because she has recently learned that she is pregnant and wants to inform her boyfriend before having to break the news to mom and dad. Rose’s decision to stay on campus leads to her being tasked to look after Kat, who has a haunted air about her. Rose attempts to frighten Kat into submission by telling her a tall tale about the school’s nuns moonlighting as devil worshippers, yet it’s Rose who gets spooked when she finds that Kat not only sleepwalks, but is prone to unnatural bodily movement. Mean