In 1897, in the rural southwestern area of Alabama known as Mitcham Beat, an aspiring politician is mysteriously murdered. Seeking retribution, his outraged friends – mostly poor cotton farmers – form a secret society, Hell-at-the-Breech, to punish the townspeople they believe are responsible. The hooded members of this gang wage a bloody year-long campaign of terror that culminates in a massacre, where the innocent suffer alongside the guilty. Caught in the maelstrom of the Mitcham War are four people: the county’s aging sheriff, sympathetic to both sides; the widowed midwife who delivered nearly every member of Hell-at-the-Breech; a ruthless detective who wages his own private war against the gang; and a young store clerk harboring a terrible secret.