Riot Recommendation: Like Dan Brown, but….

In Riot Recommendation, we take a request for a recommendation and turn it over to the Book Riot community to help them with ideas.  __________________________ This one is hot from the oven. On Twitter, Rachel asked for book recommendations on behalf of a friend: “Okay kids, need a book rec for someone who wants something “like Dan Brown, but good.” GO!   So I present it to you (without any editorial comment): what would you recommend for this reader?