The Game of Thrones series finale airs in just one week, but shortly after that, fans of George R.R Martin’s A Song of Ice and Fire book series may be in for a huge surprise. The smash-hit HBO series launched in 2011, adapting Martin’s epic fantasy series for the small screen. That same year, Martin published the fifth book in his planned seven-book series, which began in 1996. The show roughly adapted one book per season, but while Martin maintained that he would finish the book series before the TV show wrapped up, it quickly …