George R. R. Martin says some fans of his A Song of Ice and Fire books and Game of Thrones TV show have already worked out the epic sagas biggest secrets. Speaking at the Edinburgh International Book Festival, Martin said that given the size of the A Song of Ice and Fire fanbase that has built up in the 18 years since A Game of Thrones was first published, it was almost inevitable that some people would have worked out Westeros mysteries — mysteries such as the true identity of Jon Snows mother.