The Duke and I, written by Julia Quinn, is a delightful historical romance novel set in Regency England. The story revolves around Daphne Bridgerton, a young debutante, and Simon Basset, the Duke of Hastings. They enter into a fake courtship to navigate the marriage market, but their charade soon turns into something more. The Duke and I is a charming and witty tale of love, family dynamics, and the complexities of societal expectations, making it a favorite among fans of the genre.