On the 20th anniversary of the first publication of A Game of Thrones, George RR Martin told the Guardian that a special edition of the book due to be released today on iTunes represents ‘an amazing next step in the world of books.’

A Game of Thrones: Enhanced Edition [offers] ‘a world of additional content,’ said its publisher HarperCollins, ranging from interactive character maps to detailed annotations, character journeys and timelines, family trees [and] audio clips.

The book, which is exclusive to iBooks, includes an extract from The Winds of Winter. Martin said that he was excited by the opportunity to offer readers access to a whole range of secondary material …

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