Dust and Shadow by Lindsey Pogue

Courage. Love. Survival.
It’s been two centuries since the boom of the Industrial Revolution sent the Victorian era into a devastating climatic shift. Now, chivalry is dead and the frills and frivolities of the romantic era are a fading memory.
In Sagebrush Canyon, thirst rules, ignorance is power, and nothing is as it seems. Jo plans to expose the marshal for what he really is, when he plays a card of his own—his notoriously scandalous son, Clayton.
As Jo and Clayton are thrust together, lines become blurred, truths are revealed, and Jo must decide what she is willing to sacrifice in exchange for retribution.
This is a Victorian post-apocalyptic love story and adventure set in American wild west.