When I read the press advert for “Someone’s Knocking at the Door,” I thought, “Great. Another torture-porn flick.” I am happy to report that I was wrong. “Someone’s Knocking at the Door” is a masterfully-woven mix of horror, mystery, and mind trip. What is really happening to these six college friends (Justin, Meg, Annie, Joe, Sebastian, and Ray), and who is doing this to them?”