The Letter for the King is an American fantasy television series created by Will Davies and Paul Trihbits, based on the novel of the same name. There is a simple reason why for fantasy viewers, the new Netflix series looks familiar; it is because of The Letter for the King filming location. If there aren't any major scheduling conflicts, a second installment would presumably release in 2021. Netflix's YA fantasy series The Letter for the King has plenty in common with Game of Thrones — including the fact that it's based on a book of the same name. The series was released March 20, 2020. The Letter for the King is a Netflix Original family adventure series based on Dutch book De brief voor de Koning by author Tonke Dragt. The Letter for the King is a coming-of-age adventure television series developed by Will Davies and FilmWave for Netflix inspired by the classic Dutch novel De brief voor de Koning by Tonke Dragt.The six-episode series was released on Netflix on March 20, 2020. If Netflix green lights The Letter for the King season 2, productions for six new episodes could theoretically commence later in the year. The novel is one of the most beloved Dutch stories in history and has received numerous reprints over the decades since its first publication in 1962. But given the scope of production (not to mention potential delays due to the coronavirus pandemic), Netflix may need a little more time than usual. The Letter for the King filming location includes the sweeping landscape of New Zealand. Netflix’s The Letter for the King might not be the greatest adventure series, but its offer of an alternative reality is eerily well timed. Source: Netflix. NETFLIX has released a first look at their new young adult fantasy series The Letter for the King, starring His Dark Materials star Amir Wilson and Andy Serkis' daughter, Ruby Serkis.