I had heard that this book was like The Name of the Rose, and its richly-textured evocation of medieval life and its twisting, chimerical mystery deserve the comparison.
My only complaint might be that it is a bit too long. Most of the 5 narrators are exceedingly (deliberately) unlikeable, and as fascinating as it is to compare their mendacious and varying accounts of the same events, the accounts go on too long. The ending is a revelation, that soars above the feet of clay of all of the participants and leaves the reader soaring too.
This is one of my favourite books. A real page turner and truly authentic. A long read, but rewards you in a way you will not forget. A whodunnit mixed with history, mystery, philisophy, politics, intrigue, espionage and much more. Read it at once.