An Agent for Frances - Pinkerton Matchmakers, #34

Pinkerton Agent Vincent Brooks wants only one thing-to stop the southern rebels from uprising and creating another war. His assignment is to be the temporary sheriff of Bonham, Texas, which seems easy enough, until he runs across a woman he'd met eight months earlier, Francis Carlton, sneaking around in the dark, spying on the bank. Not only is the confounded woman following him around and prying into his Pinkerton business, but she has a strange way of filling his mind with desirous thoughts that shouldn't be there.
He can't be distracted, and yet, she seems to accomplish being his greatest diversion quite well.  Frances Carlton is determined to show Agent Brooks that she would make an excellent Pinkerton agent. Eventually, she'd make him a wonderful wife, too. However, the stubborn man refuses her help, and he reminds her of that every time she gets in his way. It's difficult to focus on catching the outlaws when Vincent is around, since he seeks out her kisses almost on a daily basis.
Now, it is up to her to change his mind-and his heart.