Solomon has also asked him to bring a small, sealed package which he had entrusted to Langdon years earlier. Renowned Harvard symbologist Robert Langdon is invited to give a lecture at the United States Capitol, at the invitation apparently from his mentor, a 33rd degree Mason named Peter Solomon, who is the head of the Smithsonian Institution. As of January 2013, there were 30 million copies in print worldwide. It was number one on the New York Times Best Seller list for hardcover fiction for the first six weeks of its release, and remained on the list for 29 weeks.

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 had a first printing of 6.5 million (5 million in North America, 1.5 million in the UK), the largest in Doubleday history. 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 is a thriller set in Washington, D.C., after the events of The Da Vinci Code, and relies on Freemasonry for both its recurring theme and its major characters. The Lost Symbol is a 2009 novel written by American writer Dan Brown.

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