This is the 3rd book in the Hackberry Holland series.  To better serve memories, Hack is an octogenarian who's the elected sheriff in a small Texas border town.  He's a former Korean War P.O.W. and multiple medals award winner.  He is a recovering alcoholic/whoremonger.  He was a lawyer when younger and has been a widower for over 10 years. His second in command is 40 years his junior and madly in love with him.  

Pam Tibbs, the dubious deputy, and Hack are once again on the hunt for the machine-gun-toting-serial-killer, Preacher Jack Collins.  The Preacher stumbles upon a government official, Noie Barnum, who was kidnapped and tortured by a crazed Mexican assassin called Krill.  Collins adopts Barnum and offers a strange sort of sanctuary towards the escapee. Barnum has information in his head that makes him also the target of the Russian mob and a rogue U.S. Congressman's hit team.  

If that isn't enough characters, add a Chinese female former CIA agent, who has ties back to the Cambodian Khmer Rouge during the Vietnam Conflict. Anton Ling, nicknamed "La Magdalena" by the refugees she harbors on her ranch, resembles Hack's late wife. Tibbs senses something sensual stirring deep inside Hack and takes an immediate dislike to Ling.  

All the players are desperate to bring closure to their pursuits and this helps make the story fast-paced, not unlike a fire drill.  

Usually a character-rich story with several subplots can get confusing.  Burke's tale unfolds effortlessly.