An uncommon courtship
(Book)

"Life for Lady Adelaide Bell was easier if she hid in her older sister's shadow--which worked until her sister got married. Even with the pressure of her socially ambitious mother, the last thing she expected was a marriage of convenience to save her previously spotless reputation. Lord Trent Hawthorne couldn't be happier that he is not the duke in the family. He's free to manage his small estate and take his time discovering the life he wants to lead, which includes grand plans of wooing and falling in love with the woman of his choice. When he finds himself honor bound to marry a woman he doesn't know, his dream of a marriage like his parents' seems lost forever. Already starting their marriage on shaky ground, can Adelaide and Trent's relationship survive the pressures of London society?" --,(Source of summary not specified)