This is turning out to be quite a year for horror movies. Pure coincidence, of course. And while the genre waxes and wanes like the moon over a creepy old house, it is unlikely to disappear as long as we have fears that need purging. It’s the nature of those fears that tends to shift over time — from the social to the psychological, from supernatural evil to human depravity, from what’s out there to what’s in here. “ It Comes at Night ,” a rigorous and astute film written and directed by Trey Edward Shults , plays the outside-in dialectic beautifully. Initially, the premise looks like one we’ve seen plenty of times before: An epidemic has wiped out a lot of the population; food and water are scarce; survivors barricade themselves against contamination from the sick and competition from the healthy. All of that is established quickly and obliquely. No zombies come shambling through the woods, and Mr. Shults doesn’t jolt the audience with false scares or showy plot twists. He … [Read more...] about Review: In ‘It Comes at Night,’ a House Full of Guns and Family Desperation