I haven't read any Dan Brown books, but I have read this highly entertaining blog by a linguist who likes to mock Dan Brown and his horrid writing, at length:

http://itre.cis.upenn.edu/~myl/languagelog/archives/000844.html
http://itre.cis.upenn.edu/~myl/languagelog/archives/001622.html
http://itre.cis.upenn.edu/~myl/languagelog/archives/001628.html
http://itre.cis.upenn.edu/~myl/languagelog/archives/001631.html
http://itre.cis.upenn.edu/~myl/languagelog/archives/001684.html
http://itre.cis.upenn.edu/~myl/languagelog/archives/001811.html
http://itre.cis.upenn.edu/~myl/languagelog/archives/002325.html
http://itre.cis.upenn.edu/~myl/languagelog/archives/002345.html
http://itre.cis.upenn.edu/~myl/languagelog/archives/002467.html

After reading some of that, I did open up a Dan Brown book at random in a book store, and nearly laughed out loud at the wonderfully stupid opening passage, which is also quoted in one of the articles:

> Death, in this forsaken place, could come in countless forms. Geologist Charles Brophy had endured the savage splendor of this terrain for years, and yet nothing could prepare him for a fate as barbarous and unnatural as the one about to befall him.