Sami Blood, Sami-Swedish writer-director Amanda Kernell’s debut feature, opens on a black screen and the sound of a lonely, whistling wind. Then, a knocking, as the introductory credits, white on black, appear, and a man’s voice: “Mom?” More knocking. The same voice: “Christina?” The first image appears, an elderly woman, alone, in close-up profile, lighting a cigarette, looking out a window, ignoring the voice. It’s a haunted space with that blackness, the wind, the disembodied voice, and the woman, turned away, hiding from both the voice of her son and our public prying eyes. It’s a space that sets the stage for the film to follow, the story of the girl who becomes that woman, a woman who is, indeed,…