Josie Blue has been hunting outlaws and predatory aliens for too long. As an agent for the Riders of the Purple Sage-an elite, paranormal division of the Pinkerton Agency-she's seen and done things that would break most people. Haunted by her past, she's become a shadow of herself. Her skewbald mare is lame. Her boots are worn through. Her canteen is dry. Her hat has gone missing. When folks mistake her for a man, she's too whipped to correct them.

And then Josie stumbles into Hellers Hole. Once thriving, the town is now scrabbling to survive. The new rail line offers a glimmer of hope. For Josie, it might be the last chance to escape her past and find something to hold onto.
Only, in carving out a peaceful life, she's forced to confront her demons. Can she find something worth fighting for in a town of outlaws, settlers, and strangers?