GOOD books to borrow?

so im pretty much obsessed with Dan Brown's books. The Da Vinci Code, Angels and Demons, Deception Point, Digital Fortress... so given that im crazy over these type of books, do u have any suggestions/recommendations as to what book i should look for to fulfill my "Dan Brown" withdrawals? u kno...books that come close to Dan Brown's books. it would be nice if the books u suggest can be borrowed from a local library...thanks guys.