The plot is set in Paris one of the beautiful cities in the world. A curator of a museum got murdered and in his last moment he was worried about a secret which could die with him if he didn't act fast. This was the reason he left clues to be found by his granddaughter Sophie, who is also a curator. The prime suspect of police was the man whoose name was written by the victim near his dead body. He was Mr. Langdon who was a professor and his special interest was in old symbols and their meanings. It was clear from the beginning that Langdon didn't kill the curator so I'm not breaking any spoiler here :-) Together Langdon and Sophie set out to find the murderer and the secret that cause all this havoc.
I found the puzzles quite interesting. The riddles were mind boggling and I was never able to guess any by myself. Although the climax according to my opinion was weak. I know its an over hyped book but, I am an avid mystery reader and what I feel is the point in the story where the real mastermind is revealed was a bit abrubt. And there were some other things in the plot which were rather far fetched. Specially the controversies regarding Christianity was beyond my believe.
I will not recommend this to anyone who cannot handle anything against his religion. I will rate it as 2/5 due to the weak plot and controversial stuff. The puzzles were interesting and I enjoyed the first half of the book after that the interest level start getting down. In the final part you will find that some other people exist that know the secret and the curator was aware of their presence at his death. Then the whole purpose of the story looks dubious. I got confused that why was a dying man work so hard to save something which was not in the danger after all. He should have call an ambulance instead of wasting 20-25 precious minutes of his life which turned into his last minutes.
P.s these are purely my views if you don't agree to me I don't have any hard feelings.