MC Beaton wrote her early Regencies under several names, one of which was Marion Chesney. The Armitage sisters are a family of six sisters, who have successively taken the ton by storm and married not only upwards socially, but also materially. All are beautiful, except for Frederica, the youngest and most bookish.
But it's her turn to make her debut, with her sisters worrying about finding a man who will appreciate their Ugly Duckling little sister. Meanwhile, their father, the Vicar, struggles with his decision to marry their housemaid Sarah. Frederica is so upset at the idea of having vulgar Sarah for a stepmama, she decides to run away.
How she meets the Duke of Pemberley and gets her HEA is given full treatment by Ms. Chesney/Beaton, with the reappearance of an old villain who get his just comeuppance.
Of the six books I infinitely prefer the first book, Minerva. The successive stories are less interesting IMHO, but it's fun to follow the ups and downs of their father the Vicar. He is a true John Bull character, mostly a sinner but who occasionally gets it right. He's the thread that ties all the stories together, and he's a unique character in Regency fiction - well worth getting to know. Bk 6 wraps up the storylines and provides a final "Halloo" to the Armitages.