I spent only an afternoon in East Germany before the Berlin Wall fell, but the fearful silence in public places left a lingering impression. The reasons behind it are explored by writer-director Florian Henckel von Donnersmarck in his accomplished first feature, about the Stasi, the country's secret police, which had a staff of over 90,000, plus countless informers, and spied on friend and foe alike. The fictional story here, set between 1984 and 1991, focuses on the investigation of a popular and patriotic playwright (Sebastian Koch); that the captain assigned to his case (touchingly played by Ulrich Muhe) is mainly sympathetic and working surreptitiously on the playwright's behalf only makes this more disturbing. With Martina Gedeck (The Good Shepherd). In German with subtitles. R, 137 min. a Century 12 and CineArts 6, Landmark's Century Centre.