The lost sumbol - Dan Brown

The Lost Symbol is a 2009 novel by American writer Dan Brown. It is a thriller set in Washington, D.C., after the events of The Da Vinci Code.
Released on September 15, 2009, it is the third Brown novel to involve the character of Harvard University symbologist Robert Langdon, following 2000's Angels & Demons and 2003's The Da Vinci Code. It had a first printing of 6.5 million (5 million in North America, 1.5 million in the UK), the largest in Doubleday history. On its first day the book sold one million in hardcover and e-book versions in the U.S., the UK and Canada, making it the fastest selling adult novel in history. It was number one on the New York Times Best Seller list for hardcover fiction for the first six weeks of its release, and has remained near the top since then.