You know what’s scary, alienating, lonely, and ripe for exploration in a horror movie? Emigrating to a new country after your life has been totally upended by war and you’re sent to a place that isn’t exactly inviting. That’s the sharp premise of “His House,” a horror movie that debuted at Sundance International Film Festival earlier this year merging the fears of traditional terror with the frightening uncertainty of being a refugee in a new country.