In the late 19th Century, Deadwood, South Dakota, was a boom town where prospectors came to strike it rich. It was illegally established on Indian land and attracted a wide variety of people from all different backgrounds. The town sheriff, Seth Bullock (Timothy Olyphant), came to Deadwood to open a business and ends up wearing a badge in order to keep law and order. Opposite him is Al Swearengen (Ian McShane), a local business man whose moral compass veers in the opposite direction as a local pimp and crime boss.
This show isn't for those easily offended by foul language or violence, both of which are quite prevalent. In fact, my wife left the room 15 minutes into the first episode because the "F-word" was said over 20 timesliterally. She complained the writing was lazy but in fact it was completely intentional according to creator David Milch. He wanted to recreate the rough and tumble atmosphere of the real town and by my wife's reaction; he succeeded a little too well.