Two fathers struggle to find a way to cohabit with their possessed daughter. Every night, the same thing happens over and over. Giles and Sean's daughter runs around their flat, screaming, scratching walls - possessed by a demon. They're terrified of their own daughter and don't know what to do about it.

Marie, 56, returns home. As she steps through the door of her apartment, a sense of unease washes over her. The door is slightly ajar, and music is drifting out. As she moves further inside, strange details trigger a growing sense of anxiety. She begins to wonder — is her mind playing tricks on her, or has someone really entered her home? Fear gradually takes hold, leading her to doubt her own perception of reality.