*** The Flat A documentary in which the Israeli director Arnon Goldfinger attempts to understand the nature of his late grandparents’ friendship with a Nazi propagandist. There’s something touching about the way Goldfinger obeys his moral compass. He doesn’t seem at all happy with this generational luxury of truth seeking. It’s simply a burden by a different name. In English, German, and Hebrew, with subtitles. (97 min., unrated) (Wesley Morris)
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