Sliding forward with the grim finality of Greek tragedy, this largely wordless Hungarian drama is powered by the tension between its idyllic setting and its disturbing subject matter. Following a long absence, a disaffected young man (Felix Lajko) returns to his mother’s home in the verdant Danube Delta and bonds incestuously with his half-sister (Orsi Toth). Before long the young lovers have set up house at some remove from the village, but not far enough. Director Kornel Mundruczo (Pleasant Days) uses long shots to subvert expectations: what appears to be a playful stroll by the couple turns into a rape, an omen of worse to come. Think Deliverance on the Danube, and without the catharsis. In Hungarian with subtitles.