Twenty years ago, a series of tragic events almost ripped the blue-collar town of Millwood apart. Now, in the present day, a group of disparate teen girls finds themselves tormented by an unknown Assailant and made to pay for the secret sin their parents committed two decades ago, as well as their own.

After discovering an ancient book of the occult in their new home, Donald Capel’s wife Wendy is seized by a demonic entity, nearly killing her. Donald’s niece activates a dangerous ritual in the book used to identify and banish demons, a ritual forcing each member of the family to communicate with the demon in their own unique way: to see it, hear it, or speak to it.

After their reclusive grandmother passes away, the Graham family begins to unravel cryptic and increasingly terrifying secrets about their ancestry. The more they discover, the more they find themselves trying to outrun the sinister fate they seem to have inherited.