“Black Fly” (***1/2 out of four) was a riveting family drama in the vein of “The Deer Hunter” about two estranged brothers (Matthew MacCaull and Dakota Daulby) who reconnect after years being estranged from one another; one of them soon realizes however that his older brother has become an unstable alcoholic with a violent temper which threatens him, his surrounding community, and his relationship with his wife (Christie Burke). Powerful story of family secrets, small-town dispair, and buried guilt are punctuated by scenes of scary and genuinely shocking violence. Both MacCaull and Burke sear the screen in Oscar-worthy performances. A real sleeper from writer-director Jason Bourque in his feature film debut.