Death Comes to Pemberley by P. D. James
A bestselling homage to Pride and Prejudice, Death Comes to Pemberley is set in 1803, six years into the marriage of Darcy and Elizabeth.
But soon chaos erupts when the night before the Pemberley ball, the husband of Elizabeth's younger sister is murdered, sending Elizabeth and Darcy's idyllic life into disarray.
Effectively recreating the world of Pride and Prejudice, James adds murder mystery to the mix, resulting in a carefully conceived crime novel that any Jane Austen fan will love.