The Unauthorized Dan Brown Companion Author:John Helfers (Editor) The Unauthorized Dan Brown Companion tells all. Unlike the avalanche of books specifically about The Da Vinci Code, The Unauthorized Dan Brown Companion covers all of Dan Brown's books and, crucially, has no religious agenda or political axe to gring -- these are the facts. The answers are here, covering every pict... more »ure, place, proper name, and historical event through all of Brown's books, explaining what's absolutely true, possible, improbably, or completely fictitious.« less