As any fan of the series knows the Game of Thrones is incomplete with two more books to go in the series. It was one, but I think Martin split it into two. I'm not sure why he needs two books to kill the 3 or 4 characters left, but there ya have it!
But the TV show is running into the problem of the end game. They are in season 4 and plan only 7 seasons. At this rate they'll overtake the books in a year or so and have no idea what to do next.