Ramping up the publicity campaign for Dan Brown’s long-time-coming follow-up to “The Da Vinci Code,” the publisher released the jacket art for “The Lost Symbol” on Tuesday.Showing a blood red wax seal, cryptic symbols and a shadowy skyline of the Capitol, the cover hinted at the setting for the book in Washington D.C. — “though it’s a Washington few will recognize,” said Jason Kaufman, Mr. Brown’s editor. “As we would expect, he pulls back the veil — revealing an unseen world of mysticism, secret societies, and hidden locations, with a stunning twist that long predates America.” Mr. Brown had previously written that the book would be “set deep within the oldest fraternity in history,” the Masons.

The new novel, which is being published by the Knopf Doubleday Publishing Group on Sept. 15, features Robert Langdon, the protagonist of “The Da Vinci Code” and “Angels & Demons.” Knopf Doubleday is planning a 5 million first print run in hardcover. Suzanne Herz, a spokeswoman for Doubleday, said the publisher would also release an e-book version of “The Lost Symbol.” That release date was still being worked out because the book will be embargoed until the hardcover publication.