When disgraced paranormal investigator Melody Barnum learns about a series of seemingly unrelated incidents where entire families have been injured and killed after undergoing dramatic changes in personality and behavior, she suspects them to be the handiwork of a paranormal entity bent on causing mayhem and destruction across the country. Seeing it as her opportunity to reclaim her reputation and restore her credibility in the paranormal field, Melody investigates the scene of the most recent incident and finds that the family members all disintegrated into displays of malevolence that culminated in the deaths of the entire family by their own hands. Even though the incidents she has tracked occurred in different states, she is convinced that a single entity is responsible because the circumstances were so similar, previously normal and loving families being transformed into aggressive and murderous people without explanation. Melody's challenge is to find investigators willing to work with her on so speculative an investigation. Left with few options, she contacts Audrey Szimc, a renowned expert in malevolent paranormal forces with whom she had a prior history of conflict. As more families succumb to the influence of the entity Melody and Audrey know as Giddy - termed Audrey an energy vampire that feeds on the negative human energy it inspires - they understand that unless they can stop Giddy, his path of destruction will continue as he gains in strength and seeks to spread his influence as broadly as possible. Only Melody and Audrey - forced into an uneasy partnership with a rival paranormal crew - understand the danger posed by Giddy and are positioned to stop him by using specially-crafted modern scientific instruments to thwart an enemy as old as time.