This book is a breath of fresh air after the dire offerings in Knox 3 and 4. All new characters and a much lower level of violence than before. Not a psychopathic, sadistic, sexually deviant gangster to be found, and the book is far better for it.
The pace of the action is fast enough to keep the pages turning and the history underpinning the story gets introduced in manageable segments that don't create firebreaks to the action. Of course there are the coincidences and the unlikely scenarios to skate over but they rarely get too big to swallow even in a book where a 300 year old puzzle is unravelled in a day and a half.
In a lot of ways this is a very British adventure, with not only the locations and history but the subdued level of violence and the lack of villains armed to the teeth with an inexhaustible supply of lethal armament. I really enjoyed reading it.