This style with play in the background tracks and a large size that gives the illusion of serious reading, is the ideal context for easy use by Dan Brown, of leaving a question unanswered, to switch sides (with justifications fetched) allies or opponents, or to tell a character "They lied to you!" without understanding why.
Towards the end of the book we are left with a story cobbled together so that the characters become empty puppets content under the strings of a writer who mixes legs in his desperate attempts to make some coherent narrative, often with patches literary.
The characters are empty of content. Not the slightest psychological description, any emotion, except a "man I will always love" parachuted in the middle of history. This book has all the appearance of a comic scenario, the images less.
Finally as a guideline pseudo scientific thesis on the dangers of overpopulation that the service villain tries to thwart a terrorist act. This is in complete disregard of the likelihood of self-regulation systems, exposed by the systemic approach which Edgard Morin, Joël de Rosnay and Daniel Durand are their highest representatives.