After suffering a traumatic incident, Molly (Cecilia Milocco) moves into a new apartment to begin her path to recovery, but it's not long after her arrival that a series of persistent knocks and screams begin to wake her up at night. Molly's new life begins to unravel as the screams intensify and no one else in the building believes or is willing to help her.

Sweden is under attack by an unknown force. Meanwhile, Alex is forced back to his village to arrange the funeral of his mother and he must reconcile with both his father and his ex, who he has desperately been trying to forget.