Steppenwolf ensemble member Tracy Letts adapted his play into this fearsome horror movie, directed with single-minded claustrophobia by William Friedkin (The Exorcist). Michael Shannon, reprising his role from the original 1996 production, is all crawling skin as a man convinced that unknown government powers have infested him with aphids; Ashley Judd is persuasively unstrung as the woman who buys into his delusions to escape her own problems. Friedkin embraces the story’s staginess and sense of implosion as the pair retreat into paranoid madness, a journey that includes several electrifying scares and ultimately plays out in blue light against tinfoil-covered walls. The shocker ending has a rather rhetorical quality, but you have to admire Letts for obeying his own sick logic. With Harry Connick Jr., Lynn Collins, and Brian F. O’Byrne.