Throne of Glass began as a story a teenage Sarah J. Maas posted online under the title Queen of Glass, and it kept that scrappy energy when Bloomsbury published it in 2012. It sold steadily for years, then the ACOTAR boom sent readers back through her catalog and the series found a second, much larger audience on BookTok. It has a real advantage over most big romantasy series: it is finished. Eight volumes, no waiting, and an ending that actually lands.
The novels in publication order: Throne of Glass (2012), Crown of Midnight (2013), Heir of Fire (2014), Queen of Shadows (2015), Empire of Storms (2016), Tower of Dawn (2017), and Kingdom of Ash (2018), plus The Assassin's Blade, a 2014 collection of prequel novellas. Order genuinely matters, and there are two decisions to make. First, read The Assassin's Blade before Queen of Shadows at the latest; events from those novellas hit hard in book four and land flat if you meet them out of order. Second, do not skip Tower of Dawn because it follows Chaol instead of Aelin. It runs parallel to Empire of Storms and smuggles in plot that Kingdom of Ash assumes you know. Ambitious readers do the tandem read, alternating chapters of both. It works, but simply reading them back to back is fine.
This is Maas at her least spicy. The early books are true YA, a 1 on our scale at most, and even the adult-skewing later volumes top out around 2 to 3 with a few explicit scenes in Empire of Storms and Kingdom of Ash. The content is heavier than the heat: slavery and death camps, torture, an on-page massacre or two, and a running theme of surviving what should have killed you.
The long game is the draw. Maas plants things in book one that detonate five books later, and the payoff structure of Kingdom of Ash rewards every hour invested. Manon Blackbeak and her wyvern-riding witches steal the back half of the series outright. Fair criticism: the first two books read noticeably younger and slighter than the rest, Celaena is an acquired taste before she becomes Aelin, and the POV count balloons until the finale is juggling a dozen threads. Some readers bounce off Tower of Dawn's slower pace. There is no adaptation; screen rights sit with Maas after the Hulu era ended.
When you are done, ACOTAR is the obvious next stop and runs much hotter. Fourth Wing scratches the war-school itch with dragons, and Zodiac Academy offers a wilder, messier academy saga. For more like Manon, our morally gray heroine and slow burn trope pages are good hunting grounds.