Appaloosa by Robert B. Parker

Everett Hitch and Virgil Cole are lawmen and friends who share the brutal hardships of an emerging West. But the courage that has defined them is challenged by a man without conscience or remorse. Now, Hitch and Cole have followed him to the small town of Appaloosa.

What follows is a dance of wills where villains are cast in shades of grey, where heroes hide in the blackest shadows, where women can betray with frightening ease, and where Hitch and Cole will discover the price of responsibility, honor, and loyalty in the Old West.