George RR Martin and Apple announce collaboration on interactive Game of Thrones books

A Game of Thrones: Enhanced Edition, available through Apple from Thursday, promises 'a world of additional content' including sigils, family trees and glossaries

George RR Martin has hailed "an amazing next step in the world of books" as he announced publication of a new digital edition of A Game of Thrones, featuring "a world of additional content" and an extract from the forthcoming sixth novel in his bestselling Song of Ice and Fire series, The Winds of Winter.

A Game of Thrones: Enhanced Edition was released on Thursday on Apple's iBooks to mark the 20th anniversary of the epic fantasy novel's first publication. It 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 and audio clips.