One year ago, Jill Parrish (Amanda Seyfried) was abducted, bound with tape and left in a deep hole.

Miraculously, Jill escaped her knife-wielding abductor but when police scoured the miles of dense undergrowth, they could find no trace of the hole supposedly containing the bones of other victims.

With everyone doubting her, Jill was consigned to a psychiatric facility then released into the care of her sister Molly.

One year to the day after her alleged ordeal, Jill returns home from a late shift at a cafe to discover that Molly has vanished without trace.