Near the town of
Ennis,
Montana, local doctor and former government research immunologist Wesley McClaren who has an interest in
herbal medicine and is also a weapons and self-defense expert, is called to a hospital when people start dying from an unknown but very deadly disease. He determines that the cause is a highly dangerous airborne
virus and calls in a Biological Response team, who seal off the town while doctors start treating sufferers with a vaccine. Unfortunately for them, several have already died. The source of the virus is traced to a local self-styled
rebel militia leader, Floyd Chisholm, who has given himself up after a long siege and has been arrested on weapons charges. In court, having ingested the virus himself (believing that he also possesses the vaccine) he spits at the judge, and starts the rapid spread of the disease. Floyd's
militia followers, who have been allowed to go free, attack the prison and rescue Floyd. They then proceed to invade and besiege the hospital, with much loss of life, and take medical personnel hostage including Wesley and his daughter Holly. But too late, they realize that the vaccine they were seeking at the hospital is the same as the one they possess which only delays the effect of the deadly virus. Working at gunpoint, Wesley takes a sample of Holly's blood; it shows that Holly has been infected, but somehow her body is fighting it off. Wesley and Holly contrive to escape and travel to a farm where Holly's grandfather lives. Wesley takes a blood sample from his friend Dr. Ann White Cloud, and realizes that her body is also fighting off the infection. Wesley and Ann gain access to a secret underground laboratory where Wesley used to work, where they hope to come up with a cure. Wesley finds out why Ann and Holly are not being affected by the virus: they have been drinking tea made with a specific wild herb that is known to Native American healers. Back at the home, Wesley and Holly are captured by the militia and taken at the hospital, but he manages to kill Floyd and disable the other soldiers. As soon as the biological protection team learn of the cure, they go out and pick all the flowers they can find and drop them by helicopter over the town, telling the people to boil them and drink the liquid. ==Cast==