Rain Gods - James Lee Burke

Rain Gods takes place in Texas after Hurricane Katrina has pushed some of the vice from New Orleans out to the lone star state. It starts with a mass murder and ends with a major shoot-out. In between you have lots of characters; an old sheriff who believes in the what's right, a veteran of the Iraq war who's not all the way back yet, and The Preacher who has a .45 caliber tommy gun and is not afraid to use it. They're all doing their best to catch killers, kill the catchers, and avoid being killed themselves. Very highly recommended.