George R.R. Martin is "struggling" while writing long-awaited Game of Thrones book The Winds of Winter, but says it would "feel like a total failure" to give up on it: "This could be the longest book in the series"

George R. R. Martin in Dark Winds season 3.

George R.R. Martin is still working on The Winds of Winter, which serves as the final book in the A Song of Ice and Fire series.

"I would hate that," Martin told The Hollywood Reporter. "It would feel like a total failure to me. I want to finish. If I wound up doing everything in my head, this could be the longest book in the series."