In the quaint small town of Havana, Illinois hydrologist, Curtis Meyerson arrives to investigate reports of strange occurences in the Illinois River. As he collects wate samples, he notices an eerie blue mist hanging in the air, a sign of the impending crisis about to unfold. 
Meanwhile, at the Havana Police Department, Chief Larry Calhoun is left reeling ater his own wife, Cari Lynn, a respeced nurse, violently attacks thier teenage son Robbie. 
As the town descends into chaos, with mothers lickd away and children huddled in the high school for safety, the military becomes involved, ready to take drastic action to contain what they now view as a bioweapon threat. 
Theodora, a Havana native herself, is torn between her corporate responsibilitis and the desire to protect her hometown.