House of Sky and Breath by Sarah J Maas

A rebellion known as Ophion is more powerful than ever. Bryce Quinlan, the half-Fae, half-human protagonist, and her friends get drawn into a rebel plot. In the process, they learn uncomfortable truths that upturn all the official histories they have ever believed.

This book contains obscene sexual activities and sexual nudity; excessive/frequent profanity; explicit violence; and alcohol use.