Killing Floor - Lee Child

Jack Reacher jumps off a bus and walks fourteen miles down a country road into Margrave, Georgia. An arbitrary decision he's about to regret.
 
Reacher is the only stranger in town on the day they have had their first homicide in thirty years.The cops arrest Reacher and the police chief turns eyewitness to place him at the scene. As nasty secrets leak out, and the body count mounts, one thing is for sure.