Marrying the American Heiress by Diana Bold

Michael Blake, a straitlaced English nobleman, desperately needs to marry an heiress. When he discovers that his intended bride—and her much-need dowry—has been romanced away from him by his own brother, he is forced to turn to the only other great heiress on the market.

Emma Marks is an American adventuress who has spent the last few years traveling the world—a bargain she made with her father in return for her promise to marry a titled aristocrat by the time she's twenty-five. But when Michael is accused of a crime he didn't commit, can Emma help him deal with the ghosts of his past? And can Michael show Emma she doesn't need to travel the world to be happy because love is the greatest adventure of all?