Bounty Hunter Marshal Hoss Cole: Western Adventures (Gunslinger #4)
Ash Lingam

Their destination was the Wild West town of Cheyenne. Train robberies, stray Comanche, Vigilante parties, and lost Cheyenne Braves are all a part of this Western Adventure. Eventually taking the Federal Marshal across the line between the bounty hunter and the lawman, where the difference between the legal and the illegal is a fine gray line in the dust. This line is often not clearly visible, allowing for a man to inadvertently stray to the other side of the law without even noticing it. An original Old West Tale.
(Gunslinger Series No. 4)