I really enjoyed this book because there was so much I didn't know. Such as in Ireland in this 600s women could own property, could rule, could hold high office and really had the same rights as men. It's so sad that didn't stay in effect.
The murderer I figured out pretty quickly with some fairly broad hints - when they describe a character as unusual because of certain qualities and then those qualities are important later on you can put 2 and 2 together. I ended up really enjoying this book.