When a young couple – Anne and Harold – moves into a new home without knowing it was a site of horrific murders, Anne's loneliness and strange behavior makes their relationship complicated, especially after Anne meets 'Mary', a dark presence from which she can't escape.

When a young couple – Anne and Harold – moves into a new home without knowing it was a site of horrific murders, Anne's loneliness and strange behavior makes their relationship complicated, especially after Anne meets 'Mary', a dark presence from which she can't escape.