Secrets have been revealed about Dan Brown's new book--that is, the title, which has been secret--but only after eager readers solved a puzzle.

Dante's "Inferno" is the inspiration for Brown's latest mystery/thriller, "Inferno," which will be released May 14 in the United States and Canada. Random House today announced a planned first printing of a staggering 4 million copies. It will also be available as an e-book and audiobook.

"Inferno" brings back the character Robert Langdon from Brown's previous novels, "The DaVinci Code" and "The Lost Symbol."

Like his previous books, "Inferno" is steeped in codes, symbols, secret passageways, riddles and puzzles. It will be set in Italy.

"When we turn the first page of a new Dan Brown novel, we step into a world that seamlessly infuses fascinating history, art, symbols and puzzles," Brown's editor, Jason Kaufman at Doubleday, said in a press release. "This is Dan's unique ability. In Inferno, we have the added excitement of following Robert Langdon back to the heart of Europe, where he becomes entwined in a mystery that has global ramifications…tied to the ominous and truly mesmerizing details of Dante's masterful work."

The title of Brown's book was released today after readers--through tweeting and posting on Facebook, using the hashtag #DanBrown--uncovered hidden squares in a mosaic. Each tweet or mention released one square.

The book's cover has not yet been released. Perhaps more fun and games soon?