Lodger.

Lodger is a psychological thriller that delves into the unsettling world of a paranoid landlady convinced her lodger is possessed by an unholy entity. As she takes drastic measures to contain the perceived evil, she seeks help from a trusted priest, plunging her deeper into a nightmarish reality. The film is defined by its cold, chilling visual palette, creating an atmosphere where characters dwell in shadows and the potential evil lurks in the darkness.