I really did not like this installment. I have enjoyed previous books with Robert Langdon but this one kind of felt forced. It seemed as if the author had forgotten everything that has happened in previous installments as there is no reference to it except to the Holy Grail once. Furthermore, I did not like the ending and a few plot devices that were used in the end as it seemed they were only there to shock the reader and not for any other purpose. I also found some plot lines were not explored completely and until the end, I did not know what was going on there or why it happened.