Maas began writing what would become her debut novel,
Throne of Glass, at age sixteen. She posted several chapters of the novel then titled
Queen of Glass on
FictionPress.com, where it became one of the most popular stories on the site. It was later removed from the site when she decided to publish the novel. In 2008, Maas sent the novel to agents before signing with Tamar Rydzinski of The Laura Dail Literary Agency in 2009. The series is available in 15 countries and 35 languages. Four prequel novellas set two years before the first novel were published and later condensed into a book, ''The Assassin's Blade
as well as an original novella. The second book of the series, Crown of Midnight
was a New York Times young adult best-seller. The final book in the series, Kingdom of Ash
, was released on October 23, 2018; the finished series comprised seven books plus the novella collection. The first book of the series was written in 2009, but was not published until 2015. Due to the success and popularity of the original series, it was extended, and a spin-off series was announced, featuring stories of other popular characters. The fifth book in the series and the first of the spin-offs, A Court of Silver Flames'', was published on February 16, 2021. The series was optioned for a television adaptation in 2021 by
Hulu, but as of February 2024, the television series is no longer in active development. On May 16, 2018, Maas announced her second adult fantasy series,
Crescent City. The first book, titled
House of Earth and Blood, was released by Bloomsbury on March 3, 2020. It was ranked one of the top twenty Science Fiction & Fantasy books of 2020 on
Kobo. The sequel,
House of Sky and Breath, was released on February 15, 2022 and won the Best Fantasy award for
Goodreads Choice Awards in 2022. The third installation of the series,
House of Flame and Shadow, was released on January 30, 2024. == Critical and commercial reception ==