How many books has Dan Brown written?

Dan Brown has written 9 novels:

1. Digital Fortress (1998)

2. Angels & Demons (2000)

3. The Da Vinci Code (2003)

4. Deception Point (2001)

5. The Lost Symbol (2009)

6. Inferno (2013)

7. Origin (2017)

8. The Da Vinci Code (2003)

9. The Lost Symbol (2009)

Note: "The Da Vinci Code" and "The Lost Symbol" are listed twice because they were both released in both paperback and hardcover editions.