the Da vinci code just capured the imagination of people and it got out of hand, its a good book, but its not that great a book IMO, like i said i preferred angels and demons similar style to the da vinci code but IMO better. You can really compare deception point and digital fortress with the DVCode totally different style (not genre) again. They are worth the read....
I very highly recomend books called Temple and Ice Station by Matthew reilly, there more like a movie than a book. He really has the ability to keep the action going, but hes sorta dropped off a bit so read his early works
