Dan Brown to release new Robert Langdon book in May

Dan Brown, the bestselling author of The Da Vinci Code, is to release a new book in May, publishers Transworld have announced.

The novel will be another instalment in the best-selling crime series, following Harvard symbologist Robert Langdon.

Its title will be revealed, piece by piece, via posts on social media sites including Twitter and Facebook.

The Langdon novels have sold millions of copies worldwide.

Both The Da Vinci Code and Angels and Demons have been turned into Hollywood movies, starring Tom Hanks in the title role.

A movie version of the third novel, The Lost Symbol, is still in development.

According to the publisher, the latest instalment will see the professor drawn into "a harrowing world centred on one of history's most enduring and mysterious literary masterpieces".