William Thompson was famous for clearing out rustlers from the range, so they summoned him to Oklahoma to clean up the No Man's Land of the Panhandle. He was warned to stay on the right side of the law in carrying out his duties - hard to do in the deadly territory that was the hide-out for cattle rustlers, horse thieves, and other desperadoes. But nothing was going to stop Bill Thompson from getting the job done . . .
Ray Hogan (1908-1998) was born in Missouri but spent his life in New Mexico. His father was a Western marshal and lawman. He has written over 100 books. His work has been translated into 16 languages and filmed.
A generic western, replete with stereotypes, nothing exceptional save the fact that it is based off actual people and places. I expect Mr. Hogan did the best he could with the records available at the time, but overall he's taken some factual names and written a work of fiction with them.
Boston did have a fiery and bloody end, although it went down a bit differently than written here. For the facts as far as they were recorded and can be proven, I'd recommend "Old Boston: as wild as they come" by Kent Brooks.
In transparency, I am related to said historian, and my family farms the land around the Boston cemetery, which does still exist, so I am undoubtedly a bit biased.