In 1983, a series of increasingly violent bank robberies, counterfeiting operations and armored car heists frightened communities throughout the Pacific Northwest. As baffled law enforcement agents scrambled for answers, a lone FBI agent (Law), stationed in the sleepy, picturesque town of Coeur d'Alene, Idaho, came to believe the crimes were not the work of traditional, financially motivated criminals but a group of dangerous domestic terrorists, inspired by a radical, charismatic leader (Hoult), plotting a devastating war against the federal government of the United States.