Ellie's pursuit of a possessed friend and her own worst enemy takes her across the United States into forgotten corners of the countryside through haunted hotels, ghost towns, and strange highways, and toward the site of a horrific fire haunted by hundreds of spirits.

Together with her team, plus help from an eccentric exorcist from Texas, she prepares for the fight of her life, a fight destined since her own childhood.

Ellie's past and present collide in a final confrontation that may give her a chance to finally be rid of her most dangerous personal demon—if he doesn't kill Ellie first, along with the people she cares about the most.