In the ballrooms and drawing rooms of Regency London, rules abound. From their earliest days, children of aristocrats learn how to address an earl and curtsey before a prince-while other dictates of the ton are unspoken yet universally understood. A proper duke should be imperious and aloof. A young, marriageable lady should be amiable?but not too amiable. Daphne Bridgerton has always failed at the latter. The fourth of eight siblings in her close-knit...