Deadwalker

Dead men walking.

Nox, the Coilhunter, is enjoying an uncharacteristic respite in the lawless land of the Wild North, thanks to many years of gunning down bad men. When those bad men start returning from beyond the grave, rest time's over, and it's time to draw up some Wanted posters for the well-rested.

Plagued by wave after wave of his own past kills, Nox struggles between his own survival, the welfare of the Northfolk, and the hunt for whoever's out there digging up the dead. 

This is a standalone book in the Coilhunter Chronicles series, which can be read in any order.