Is Game of Thrones Season 8 in the books?

Related questions

1. Will George RR Martin ever finish Asoiaf?
2. What does RR stand for in George RR Martin?
3. Is George RR Martin still writing Game of Thrones show?
4. Is George RR Martin Rich?
5. Will George RR Martin change the ending?
6. Do the Game of Thrones books have an ending?
7. Is Game of Thrones book series finished?
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Tags

1. #weiss
2. #final
3. #series
4. #april
5. #concluded
6. #television
7. #fantasy
8. #adapted
9. #produced
10. #season
11. #eighth
12. #thrones
13. #benioff
14. #drama
15. #david
16. #premiered