Darcy in Want of a Wife by Laraba Kendig

Darcy seeks a wife.
Elizabeth requires love.

Elizabeth Bennet has an unexpected opportunity to participate in a London Season. Her wealthy new friends invite her to lavish parties, and she is surprised to garner the attention of eligible gentlemen.
Fitzwilliam Darcy is in want of a wealthy and well-connected bride, a woman truly worthy of the Darcy name, but can he find one who reminds him of the lady he admires? As he continues his search, he realizes that he cannot forget Elizabeth Bennet’s fine eyes … and he is alarmed when he learns he has competition for her affections.
Lady Catherine de Bourgh is absolutely determined that Darcy must marry her only child, Anne de Bourgh. He is not particularly interested in what she wants, but she unearths an all-too-willing accomplice who will force Darcy’s hand. When one of Elizabeth’s sisters goes missing, Elizabeth must rely on Mr. Darcy to avoid scandal and preserve their chance at happiness.

Over 500 pages. This is a sweet and clean, low angst Pride and Prejudice variation where all of the Bennet sisters have happy endings.