A Matter of Heart, Lone Star Brides Series by Tracie Peterson and published by Bethany House.
Jessica Atherton is a wealthy young woman whose heart was broken when the man she intended to marry wedded another. But her world is upended when two men come into her life and both manage to stir her heart. Harrison Gable is a rich young lawyer who intends to travel the world and live a life of opulence. His ambitions match Jessica's dreams, but her heart has begun to change.
Austin Todd, former Secret Service agent, enjoys working now as a Texas Ranger cattle inspector. But learning of forged gold certificates and missing printing plates, he's drawn back into the world of intrigue and agrees to help solve the case. Austin is well-thought-of and admired in the community. Jessica is drawn to his kind nature and the unspoken pain she sees in his eyes. Will Jessica choose financial security or follow her heart?