When family man Joe Crawford confronts a young mother abusing her toddler in a gas station parking lot, he has no idea of the chain reaction he's setting in motion. How could he suspect the young mother is part of an ancient fire cult, a sinister group of killers that will destroy anyone who threatens one of its members? When the little boy is placed in a foster home, the young mother burns herself alive in grief and rage...and the cult's fanatics begin their mission of terror as Joe and his family are plagued by otherwise inexplicable events. 

One night Joe smells ashes in his daughter's nursery. A kindly old couple whose house Joe renovated is found butchered ritualistically. Pushed to his limit, Joe becomes friends with the local police chief Daryl Copeland, who decides to accompany Joe to the cult's isolated compound, where the chief is murdered and Joe is taken hostage. 

Joe awakens in the huge three-story house he has been renovating for a beautiful client and her husband. His lovely client turns out to be the leader of the fire cult. Joe and the little boy he saved are the planned sacrifices of the cult's midsummer ceremony. Joe's wife and some local policemen save Joe, but in a wild shootout the house is set ablaze and the little boy is taken hostage upstairs. Joe is left to do battle against the cult...alone.