In Twenty Mile Bottom, Mississippi, a grandmother mysteriously disappears. Her 18-year-old grandson, Roy Gene, smells a rat and launches his own investigation. Unbeknownst to him is a domestic terrorist plot masked by a renegade religious cult run by a gypsy fortuneteller and his alcoholic evangelist grandfather. The grandfather's infamous Halloween service, The Devil Walks at Midnight is the emotional lynch pin to a corrupt theology of fear that keeps everyone in line... except Roy Gene's grandmother... and Roy Gene.