This loose sequel to the 2012 British horror film takes place in the early years of World War II, as two teachers and a group of grade-schoolers seek refuge from the blitz in the haunted country manor of the first movie. The tone is uncommonly funereal, the filmmakers alluding frequently to the untold civilian casualties England suffered during the war. The horror registers primarily as metaphorical: despite their best efforts, the schoolteachers can’t protect their charges from the specter of random death. Director Tom Harper conveys this theme through dark, moldy-looking mise-en-scene and the uniformly sullen performances he elicits from the cast; you’re more likely to find this depressing than scary.