“Game of Thrones,” the fantasy epic imagined more than 20 years ago by author George R.R. Martin, will have its much-anticipated finale on HBO later this year. But in a strange twist never before seen in literature, Martin will himself…

“Game of Thrones,” the fantasy epic imagined more than 20 years ago by author George R.R. Martin, will have its much-anticipated finale on HBO later this year. But in a strange twist never before seen in literature, Martin will himself…