Da Vinci Code part two.

The much anticipated follow the "Da Vinci Code by Dan Brown was released yesterday in the U.S. with a positive response from critics, but the novelist admitted he felt pressure to how they would be sales.

"The symbol lost" comes six years after Brown's last book and again in the footsteps of Harvard professor Robert Langdon.

U.S. hit bookstores at midnight with a circulation of five million copies and expectations that the book could revive the publishing industry.

"There are a lot of pressure. It is a continuation of" The Da Vinci Code, "said Brown, 45, the" Today "program on NBC in an interview published yesterday." Want to make sure is a hit.