The Texan and the Lady — Jodi Thomas

Jennie Munday left her sleepy Iowa home to become a Harvey Girl. On a train bound for Kansas and her exciting new life, she met Austin McCormick, a gruff, abrasive Texas marshal who seemed to be everything she disliked in a man. But when their train is held up by gunslinging outlaws, Jennie is thrown together with the stubborn Texan -- and learns that the law can be deadly and dangerously filled with desire...