From Amazon's comments:
"The book is really worth for its money and it will keep you awake for a few days. You will refuse to close the book until you reach the end. In the beginning you will not understand a thing, what is going on, who are these people, what are they trying to do. Never mind, just carry on. Eco meant the book to be this way! Enjoy the book and if you dont understand some historical remarks never mind, just continue, dont stumble upon the little details and the dates, get the big picture. You will have plenty of time to think about it after you have finished but the main thing is to go entirely through the book and finish it. It will leave you with your mouth open. Dont let yourself think :I cant understand this, I am an idiot therefore I will not continue. No, just finish the book , at the end you will be rewarded as is the case with all of Ecos books. After all there is no such thing as "I dont understand the book", there is only "I didnt let myself free enough to understand it"."