I have read all of Karin Slaughter's books, and absolutely loved each one. I really like the Grant County series, although I also thought her stand alone book, Triptych, was excellent. I have been very excited waiting for the release of Fractured. However, I did not feel that this book was as good as any of her others. It was still a good read, but after Triptch I was expecting an amazing story, with many twists in the plot. The book did not deliver. I did not think anything was particularly surprising. There were not 'loads of plot twists' despite what other reviews may say. I don't want to spoil the story, so I won't go into detail, but don't expect a list of suspects, and then a big "OMG - he did it" at the end. It ended exactly as I thought it would.
To summarise, I would still recommend Fractured to Karin Slaughter fans, but I would warn that this is probably the weakest out of all her books to date.