Imagine a library filled with every book in the world, none of them have titles on the cover and the pages are blank, but when you open one you are instantly transported to the world within the book. You get to live the story as any character for as long as you like. And when you come out of the story, almost no time has past in the real world.
And its all so much fun, until you ‘read’ A Song of Ice and Fire.
