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In the Regency era, all the ballrooms and drawing rooms of London are bound by unwritten and unbreakable rules: how to speak to an earl, what knee-jerk reaction to a prince... A duke should be imperious and indifferent, and a young lady of marriageable age should be friendly, but not too friendly. Daphne Bridgerton, the fourth of eight descendants of a surprisingly close-knit noble family, has a friendly disposition, unlike most haughty young ladies of her age, so she easily finds common ground with almost all the young men of London's upper classes. But the Viscountess Bridgerton cannot wait for an interesting marriage proposal for her eldest daughter. Simon Bassett, the Duke of Hastings, has recently returned from abroad and is trying to avoid the hustle and bustle of the world, even going out, because he has decided never to marry. He has personal motives for this, caused by a family drama. Meeting the sister of his best friend Anthony Bridgerton opens up a different path for him. If Daphne agrees to their pretend courtship, Simon will be able to refuse the mothers of young ladies who are eager to attract the attention of the unmarried duke. In return, Daphne will see new perspectives and her reputation will skyrocket. Will this plan work if only one thing is true in the cruel, glittering, gossipy world of the London elite: love cannot be held back by rules.