I've owned this book for...years (wow, far longer than I thought by at least a couple of years!) but I'd never read it before now. It both was and wasn't what I was expecting.
The book is broken into three sections: Darcy, The Colonel, and the Family. The first two sections focus on Darcy after his marriage and the issues he and Elizabeth face surrounding that (Aunt Catherine, a baby, etc.) and Colonel Fitzwilliam as he deals with what war has done to him mentally and emotionally as well as finally finds a woman he can't live without. The last wraps up the situations both face as well as other elements.
I can't in good conscience recommend this book. The attempts to make it sound contemporary were...to me, nonexistent and there were several plot points that I found...implausible is a kind word.
Yet I loved this book. I've not laughed so hard at an Austen-esque book since Austen herself. Yes, some of the characters were a bit (more than a bit OOC though there were reasons given, but this book shocked loud laughs out of me again and again.
The best had to be when Lady Catherine and Marie Fitzherbert (the Prince regent's wife whose marriage was dissolved by George III) stage a noble raid on a woman who is trying to sever all ties between the woman Fitzwilliam loves and her child from her first marriage. How they get her to change her mind is hilarious and worth the read by itself.
There were also some truly poignant moments. I've never seen a P&P pastiche deal to a such a degree with Col. Fitzwilliam's profession and the toll that would take on him.
So while I say try this only if it sounds really interesting to you (or like me, you have to try basically every P&P pastiche once), this is basically one of my guilty pleasures.