The Revelators by Ace Atkins

Shot up and left for dead, Sheriff Quinn Colson has revenge on his mind. With the help of his new wife Maggie, rehabilitation, and sheer force of will, he's walking again, eager to resume his work as a southern lawman and track down those responsible for his attempted murder. But someone is standing in his way: an interim sheriff, appointed by the newly elected Governor Vardaman, the man who Quinn knows ordered his murder. Vardaman sits at the top of the state's power structure--both legal and criminal--and little does he know, Quinn is still working to take him down.