The Parker family, who lives in a secluded small town, endures a tragic loss when the matriarch dies unexpectedly. This event forces the daughters, Iris and Rose, to take on increased responsibilities within the family. As they struggle to cope with their mother's death and their father's increasingly erratic behavior, a shocking family secret begins to unravel. Local doctor Barrow discovers mysterious patterns and disturbing evidence that lead him to suspect the Parkers are hiding something sinister.

Meanwhile, Iris and Rose wrestle with their moral dilemmas and growing fears as they are pressured to follow their family's gruesome traditions. Their internal conflict intensifies as they realize the horrifying truth about their ancestry and way of life. The tension reaches a breaking point when the outside world closes in, leading to a climactic struggle that threatens to expose everything. The film builds an atmosphere of relentless dread as it explores themes of familial duty, isolation, and dark legacies.