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★ ★ ★ Barbara An exiled East Berlin physician (Nina Hoss) has just arrived in a provincial hamlet on the Baltic Sea, where she quietly plots her escape to West Berlin while seeing patients and avoiding the advances of a brawny doctor (Ronald Zehrfeld), who’s been conscripted by the Stasi to pass along intelligence on her. The movie’s quiet power comes from its air of meticulously maintained suspicion. In German, with subtitles. (105 min., PG-13) (Wesley Morris)