Series numeration from GoodReads.com.

Self-made civil engineer Geoffrey Brookhouse has unexpectedly inherited the dukedom of Grenwood. But he has a secret that could ruin his family. Hoping to save his timid sister from that fate, he seeks to marry her off to a respectable, protective gentleman. With the London Season imminent, Geoggrey hires Elegant Occasions to orchestrate her debut. Yet Lady Diana Harper, spirited fashion expert, proves more than he bargained for. Suddenly, Geoffrey's sister is emerging from her shell, and he is beleaguered with social invitations and gossip! Worse, Diana is attempting to transform him into a presentable duke - when all he really wants is to make her his own...

Diana doesn't know what to make of the handsome, disheveled duke. The man bristles at the very idea that his fashion faux pas might spoil his sister's chances. Yet Geoffrey's stubbornness simply inspires Diana to ruffle his feathers - by setting him on a course of self-improvement. Although there's something endearing, even irresistible about his flaws, can a man who hates the ton tolerate a woman who makes her living catering to them? Little does either know that they have more in common than they suspect - and that two can create a society all their own...