Fear is abroad in the Deadlands as a string of brutal killings and cattle mutilations trouble a frontier town in the Arizona Territory, nestled in the forbidding shadow of the rugged Thunder Mountains. A mule train is massacred, homes and ranches are attacked, and men and women are stalked and butchered by bestial killers who seem to be neither human nor animal. Meanwhile, a ruthless land baron tries to buy up all the surrounding territory and possibly bring about an apocalypse.

Once an officer in the Union Army, Tucker Bringloe is now a worthless drunk begging for free drinks at the corner saloon. When he's roped into a posse searching for the nameless killers, Tuck must rediscover the man he once was if he's to halt the bloodshed and stop occult forces from unleashing Hell on Earth . . . when the Thunder Moon rises.