The duel at Murphy's Ford

Eli Riley was the marshal of Murphy's Ford. It was a prosperous town, growing with the aid of copper mining and a peaceful place in which to live. Then something went wrong. The town's water supply was poisoned and folk became ill. Blame was laid on the copper company and trouble started when two prominent citizens were killed. Then a stranger came to town, looking to avenge their deaths. Murphy's Ford was divided and a vigilante mob set out to make trouble for the mine owners. Marshal Riley found himself in a shoot-out that left him injured as the water poisoners became known and the demand for their lynching grew. How would it all end?