I enjoyed this book, although I didn't expect to. It's not a genre I would normally choose, and the recommendations from Kate Mosse and Diana Gabaldon on the cover didn't help :)
A bit too gory in places, but well-written, and though I'm hardly an expert on the 12th century it seemed well-researched. I liked the fact that the characters spoke in a contemporary way (no thees and thous), and the way she worked in quite a lot of social and political background -- for example about the law, the relationship of crown and church, and the Crusades and their effect on relations between Christians and Muslims. Plot-wise, it's a clever mélange of historical whodunnit and modern forensic thriller.
The plot was maybe a bit far-fetched, but I enjoyed the characters, especially Gyltha, Ulf and of course Adelia and Rowley. I found her characterization of Henry II intriguing too, and would have liked to see more of him.