P.D. James paperbacks

The year is 1803, and Darcy and Elizabeth have been married for six years. There are now two handsome and healthy sons in the Pemberley nursery, Elizabeth's beloved sister Jane and her husband, Bingley, live within eventeen miles, the ordered and secure life of Pemberley seems unassailable, and Elizabeth's happiness in her marriage is complete. But their peace is threatened and old sins and misunderstandings are rekindled on the eve of the annual autumn ball.

The Darcys and their guests are preparing to retire for the night when a chaise appears, rocking down the path from Pemberley's wild woodland, and as it pulls up, Lydia Wickham, an uninvited guest,tumbles out, screaming that her husband has been murdered.