An Agent for Charity - Pinkerton Matchmakers, #9

Charity's escapades have only been between the pages of books. Seth is a man with a temper. Together, they just might discover the love they've been looking for. Charity found the ad to become a Pinkerton detective and knew it was her chance to break out of the pages of her books and live a life of adventure. She knew all about being a detective. She'd read countless books about it. After all, how hard could it be? Seth is a good Pinkerton detective, but a little rough on the outlaws that he brings in.
It's his temper. When lead detective, Archie Gordon, demands his agents are to be paired with new recruits, Seth is disgusted. When he finds out they're women, he's ready to quit. Except he's broke. And then when he finds out he has to marry her-well, there just aren't any words, just the hope she'll quit. Thrown together on a case with a secretive client, a mysterious stranger, and mail order brides present a harrowing adventure with surprises.