The upcoming book “Untitled” by Anonymous has left buyers for nationwide bookstores perplexed during the last few days.

The mysterious book was described as a 320-page, nonfiction, hardcover release with photos and costs $26.99 per copy. The publisher, Little Brown, encourages bookworms to pre-order the book now to ensure delivery by its November release date.

There’s a clue, by the way, to what the upcoming book “Untitled” is all about – “the inside story of life with one of the most controversial figures of our time.”

Book buyers are still clueless about the identity of the author or the mysterious subject of “Untitled” as the publisher did not release any more clues. They just promised a “massive media rollout” with a confirmed “60 Minutes” appearance, The NY Times reports.

“Untitled” by Anonymous hits bookstores nationwide on November 14, 2011.