The story of the Tin Star, the Marshall, who is never actually named... He's been appointed as an officer of the law for the sparsely populated Landon County out west. The land is still untamed. Few buildings or roads. He has to ride a horse the whole way there, he'll be more or less the only enforcer of the Law within a hundred and fifty miles, with little chance for backup.
Trouble starts immediately. The Marshall finds a miner and a herder who are at each others throats, holding weapons up and shouting accusations. He does his duty and defuses the tension, questioning each side and determining that both men had been careless and neither was more at fault for the dead calf or thrashed mining gear. He convinced them to apologize and become friends.
The Marshall was the only force of law in the land, and he was put to the test again and again. Facing down a terrifying bear and killing it before anyone could be hurt. Refusing a generous bribe and then destroying a mining company's dam that threatened the whole area with flooding when they would not listen to reason. Tracking down and rooting out a brutal and violent gang dozens strong that would stop at nothing to rob and steal as much money as possible.
Gathering evidence and studying law before having a legal showdown with a fake Marshall that tried to take over the town. Riding out to track down missing people, make peace between settlers and tribes of Indians in the area, a dramatic showdown over a heavy stagecoach loaded with gold (no sun mages, it was worth millions of rings). Meeting, allying with, and defending an exotic Mexican countess and her band of monks.
And finally, uncovering a conspiracy that reached all the way up to the halls of the government, a desperate attempt by powerful business interests to destroy the rail-road being built at any cost because the competition would cost them money. After a pitched battle at a makeshift fortress and a wild train chase, the Marshall marched right back to the big city and arrested the whole family responsible for it all and saw them put to trial and sentenced to death.
The Law came to Landon County... And for a lot of people, this was good. They built homes and businesses and were safe and prospering. But for the Native Americans, this represented the slow, inexorable conquering of their lands by the settlers.
How would it have gone if the Marshall were not such an incorruptible agent of the law? Nobody would have known if he had taken a bribe or two, arranged to 'forget' about a couple of crimes. What if he hadn't made his narrow escape, any one of the dozens of times he was imperiled? What would the fate of Landon County have been instead. Probably poorer and more dangerous, perhaps abandoned entirely when the valuable mines dried up.
There would have been other Marshalls, coming in twos and fours as more people settled out west. But The Marshall was the first, and a shining example of law enforcement in the face of impossible odds for decades to come.