The title character is Luke Chilson, and while he's a bounty hunter, he's no killer. He's on the trail of a real killer named Burt Faradin and his gang, and when they take over a town, nobody sides with Chilson. They don't like bounty hunters. By the time they realize their mistake, it's almost too late.
The way Albert works out the story is interesting because before it's over [BIG TIME SPOILER], Chilson's had his arm broken and his gun-hand mangled. There are only a couple of gunfights in the book, which, believe it or not, is more character-driven than most people expect in a paperback western. Harry Whittington was good at t this kind of book. Albert is right there with him. If you like westerns and haven't read any by Albert, you're missing a good thing.