Resolution - Robert B. Parker

The dust has yet to settle in the new frontier town of Resolution. It's barely even a town: a general store, a handful of saloons and a run-down brothel for the workers at a nearby copper mine. No sheriff has been appointed, and gunslingers have taken control.
Amid the chaos, itinerant lawman Everett Hitch has created a small haven of order at the Blackfoot Saloon. Charged with protecting the girls who work the back room, Hitch has seen off passing cowboys and violent punters - though it's his scheming boss, Amos Woolfson, who stirs up the most trouble.
When a greedy mine owner threatens the local ranchers, Woolfson ends up at the centre of a makeshift war. Hitch knows only too well how to protect himself, but with the bloodshed mounting, he's relieved when his friend Virgil Cole rides into town. In a place where justice and order don't yet exist, Cole and Hitch must lay down the law - without violating their codes of honour, duty and friendship.