I heard the movie was bad... but not THAT bad. It seems that bringing The Da Vinci Code to the big screen was not the best decision for Dan Brown and his publishing company, Random House Inc. His book sales have dropped 87%!!

For three years, nothing could kill it: In an age of fractured audiences and weakened attention spans, The Da Vinci Code became the universal beach read, dominating hardcover best-seller lists through war, hurricanes, a presidential election and the ever-changing tastes of a fickle public.
Then the movie version came along.
In the seven weeks since the Tom Hanks vehicle opened to devastating reviews, Dan Brown's art historical thriller has lost its luster at the checkout counter. Sales for its many editions -- the mass-market paperback, the higher-priced trade paperback, the illustrated paperback -- have all fallen by an astonishing 80% or more, according to Nielsen BookScan, which tracks roughly 70% of the market. (Crains NY)