The Peacemaker (Men of the Saddle #1) by Lori Copeland

Bull-headed Wynne Elliot has one goal in to track down Cass Claxton and shoot him dead for leaving her at the altar and running off with her money. But when Cass's brother Cole shows up, Wynne finds herself on an unexpected adventure, and she just might lose her heart. Beloved author Lori Copeland takes readers back in time to an era when cowboys were heroes and the rules of the Wild West prevailed. Lori's trademark blend of humor, romance, and Christian content make this an irresistible read.