Page last updated at 08:44 GMT, Wednesday, 8 July 2009 09:44 UK

Puzzle set for Da Vinci follow-up

Dan Brown's The Lost Symbol
Six million copies of the book will be printed on its first run

Promotion and advertising for Da Vinci Code author Dan Brown's new book, The Lost Symbol, will be a series of puzzles, his publishers have announced.

The book, which features Harvard Professor Robert Langdon for a third time, is due for release in September.

Publishers Doubleday say they will use social networking sites like Facebook to release codes, puzzles and teasers.

The front cover image of the book has been revealed as a key and symbol hanging over the Washington DC skyline.

The storyline has been kept under tight wraps but it is believed to focus on freemasonry, with the lost symbol of the title a reference to a ciphered pictogram in an ancient book called The Key of Solomon.

The publishers have announced an initial print run of more than 6m copies for the release on 15 September.

Film success

Brown had previously told the BBC that writing the new novel was "a strange and wonderful journey".

It has taken six years for him to pen a sequel to The Da Vinci Code, which has more than 80 million copies in print.

The film version of the first Langdon book Angels and Demons, starring Tom Hanks, topped the UK and US box offices earlier this year and has earned nearly $500m (£310m) worldwide.

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