Marshal Oliver Blackstone: Deadly Shadows - Paperback

After two years serving as a US marshal, policing the country's newest and largest district, Oliver Blackstone's reputation as a lawman was stellar, and those who'd originally doubted his ability to get the job done, were now squarely in his corner.
However, with the rapid increase in population, settlers are spreading into areas that have been abandoned for centuries, along with the secrets that they hold. Now, one of those secrets has awakened, leaving a series of brutal murders in its wake.
After receiving a tip from a Navajo scout, Marshal Blackstone departs on a journey that will challenge his determination, endurance, and his very core beliefs in pursuit of an outlaw who himself, may be an unwilling pawn in a deadly game of hide and seek.
Nevertheless, the marshal has an unblemished record of always getting his man, and is determined to catch the killer and bring him to justice. It's a tall order to fill, especially when the hunted is also a hunter with its sights set on Oliver Blackstone.