Girls of Paper and Fire had great world building, beautiful but dark, with an excellent plot and characters I felt invested in. I loved Lei and Wren, and the caste system was interesting, with not just social but physical differences between them. It was a bit slow going at times, but it fit within the story and I didn't mind, just an observation.

This is a society where a group of girls are essentially forced concubines for the king, most of that doesn't happen on the page but there is a scene with SA, so be aware of that going in if that's a trigger for you. The story ends on a cliffhanger, and I'm definitely planning to continue with the trilogy.