After swearing off giving book updates, "Game of Thrones" writer George R.R. Martin says he's "three-quarters done" with his latest book in the fantasy series. "The Winds of Winter" will be the sixth novel in the series "A Song of Ice and Fire," on which "Game of Thrones" is based. Martin was on the “Late Show with Stephen Colbert” last night and said he's making progress on the new novel, but it's still not done yet. Martin said the book's over 15-hundred pages long and all the characters interweave, and it's going to take a while to "finish all that weaving."