A woman living alone in a drab apartment block may or may not be losing her mind in Knocking, the feature film debut of Swedish documentarian Frida Kempff. The details of the story are nothing new but Kempff's own vision is unmistakeable. Distinguished by striking frame compositions and camera moves as well as a perfectly balanced lead performance by Cecilia Milocco, Knocking is a modest powerhouse — a threadbare narrative that's gorgeously shot, beautifully performed and spooky as hell.