I loved This book. If you didn't like your college philosophy classes, it may not be for you. I love philosophical, logical and theological arguments and this was chock full of them. There was also very interesting history from the middle ages. 
 The format of the book was great. It was broken up into seven days of the investigation and each day was broken into time fragments. Most of the sub chapters were between 10 and 20 pages which makes it easier to take in. 
 The mystery was intriguing but it shouldn't be your main reason for reading the book, this is no fast paced thriller. It's a slow contemplative one, which I found intriguing.