Dance With The Devil - The Devil's Own, #1

Johnny Fierro's a gunfighter-maybe the best-so tired of killing, he'd welcome death. Then he hears that his estranged father faces a battle for his land in the Cimarron Valley. Fierro swore to kill his father, and this is his opportunity. But he hadn't reckoned on a share of the ranch, or a brother he never knew existed. While his upright father and Harvard-educated brother struggle with his violent past, Fierro must wrestle with the possibility his mother didn't tell him the whole story-before the bullets start flying.
Book One of The Devil's Own Series.