Unlike other comments here I found the book completely engaging in spite of Dan using his typical 'formula' of Langdon and a woman both chasing and being chased. The addition of a visionary tech mogul who brings up the renown questions of where we came from and will head via AI is brilliant in itself. Having read all of his books, this one rates as high if not higher than his most popular "DaVinci Code". And Langdon as always proves his ability to decipher even the most challenging codes or symbols which in this book are shown graphically. Highly recommended.