This is the worst book in the Robert Langdon series. And I loved the previous three books that feature 'Robert Langdon'(Angels and Demons being my favorite). 
 Reading this is a waste of time and energy. The pacing was lame. There was no interesting character aside from the genius Harvard symbologist. The mystery was awful, and the story as a whole was lame and absurd. And gosh, the ending was really infuriating.