Sarah J. Maas (born 5 March 1986) is an American fantasy author, best known for her debut series Throne of Glass, first published in 2012 by Bloomsbury and A Court of Thorns and Roses series, first published in 2015 also by Bloomsbury.Maas began writing what would become her debut novel, Throne of Glass, when she was sixteen years old. After writing several chapters of the novel (then titled Queen of Glass), she posted them on FictionPress.com, where it was one of the most popular stories on the site. It was later removed from the site when she decided to try to publish the novel. The story line of the series is based on Cinderella, with the premise of "What if Cinderella was not a servant, but an assassin? And what if she didn't attend the ball to meet the prince, but to kill him, instead?"