Read "The Da Vinci Code", "Angels and Demons" and "Digital Fortress".
Preferred Digital Fortress.

"The Da Vinci Code" is just a typical "If I tell the story like this and add a trillion plot changes, they will deffo turn it into a movie"-book.

So... not bad but have read better books

Am curious about the movie though! 'Coz in my mind I did NOT see Tom Hanks when reading about Robert Langdon