Despite his city being torn apart by riots and unrest, the St. Louis mayor has decreed that the beloved Fourth of July festival WILL go on as planned. This leaves public safety manager Logan Field at his wits' end. How can he protect the city's residents and his own job, especially in the light of a deadly attack in Chicago, a vanished local boy, and a series of disturbing occurrences that are drawing closer and closer together? City-wide panic brews - something is horribly wrong.

Desperate for help, Logan turns to a struggling hunter and they link up with a professor who believes he just might know the cause of the incidents: an ancient evil, dormant for centuries, now awakened. There is no time to waste as the trio races to find to confirm their fear and discover how to face it down - because an entire city and its millions of lives hangs in the balance.