I would suggest that you would have enjoyed Cadfael books more if you hadn't started with the last one in the series of 20! It makes a great deal more sense if you know more of the background and relationships of the characters and the historical period, which you can gain by reading the other books (or at least some of them) first. Much of the pleasure from reading this book is seeing characters whom you already 'know' developing and depening thieir relationships.
Also, some of the characters in the TV versions are badly cast and portrayed - particularly Beringar - so it can be hard to fit preconceptions from watching the TV into the original books. Please try again with an earlier book - perhaps One Corpse Too Many or St Peter's Fair, both of which are full of surprises. You could even try something novel and begin with the first one - A Morbid Taste for Bones.