Anchor Books will publish Dan Brown’s The Lost Symbol in paperback on October 19, the house announced today. It will release four million copies of the book as a premium mass market, priced at $9.99. On November 2, Doubleday will publish The Lost Symbol Special Illustrated Edition, a $35 hardcover.

Doubleday published the book in hardcover last September. According to the publisher, it has sold more than 5.5 million copies in North America. It broke Random House sales records when it sold one million copies in its first day on sale, and hit another Random House landmark when it sold two million copies in its first week. The book has been optioned for film by Columbia Pictures.