The idea of a murder mystery twist on Jane Austen's work is not particulary innovative, but it's still a fun premise. Successful books in this vein manage to balance the historical, romantic, and comedic/satiric elements of Austen's original with the demands of a mystery plot and genre. Unfortunately, Pride and Premeditation didn't really succeed on either front.
While the author included a note on historical accuracy (and her choices about when to stick to historical reality and when to stretch things a bit), it didn't cover everything, and the overall feel and flavor of the book suffered from the historical slopoiness - it took a while before I could even tell for sure that it was meant to be set in the Regency era.
As for the romantic element - it takes a back seat to the mystery, which is fine, but doesn't develop successfully even in the background the way a slow burn romance usually would. Elizabeth's attraction to Darcy seems forced in at awkward intervals, and there's no other romantic storyline but theirs, since Jane and Bingley don't even meet on the page, and their relationship is just a throw away line at the end. The comedy of manners/social satire of the original isn't present, either, replaced with a heavy-handed feminism that wouldn't be out of place except it just lacks any subtlety or sense of history. (Something else, far more petty, that bothered me was lowering Elizabeth's age to 17 - it might have been to make the book fit the requirements of YA, but it didn't make a lot of sense, and it made the lines about Georgiana being only 15 slightly ridiculous.)
Then there's the mystery itself. The solution manages to be at once convoluted and too obvious. The most fun thing about this book is seeing the ways in which the author molded Austen's original characters into her law firm/murder mystery set-up, but that approach means anyone familiar with the original Pride and Prejudice can see the revelations and villains coming from a mile away.
Overall, there just wasn't much going on in this book. On every front, it lacked development, subtlety, and substance, taking the easy, flimsy, or heavy-handed option at every turn. I'm no purist, and I love a good Jane Austen fanfic or adaptation - but this was merely a mediocre one.
Thank you to NetGalley and HarperTeen for the advance review copy!