It follows Hannah Queen, a disabled woman who monitors the CCTV on a rough estate. One day she notices a man she knows to be a violent criminal lead a woman into a blind spot in the camera coverage and when he emerges again, there’s no sign of the woman who appears to have vanished into thin air. Hannah is convinced she’s been murdered but the apathetic policeman in charge of the case, Tony Warden dismisses her fears. Yet Hannah is determined to find out what really happened in the blind spot and it seems she must put her own life in danger in order to do so.