These are the terrifying tales of the unwanted neighbors who turn home sweet home into home sweet hell. A look inside the lives of horrific neighborly disputes and what happens when a simple issue turns into the worst night of a family's life. Do you really know who lives next door? This true-crime series tells the chilling tales of those with the misfortune to unwittingly take up residence within a stone’s throw of a psycho or killer.

Three adult siblings find their family thrown into disarray when their recently widowed mother, Vivien, declares she is in love with a new man. The tension his presence creates threatens to drag the whole family towards tragedy, and perhaps crime.