Crown of Midnight (2013)

Now working as the king's assassin, Celaena grapples with her loyalty to the crown and her growing discontent with the oppressive regime. When tasked with eliminating a target, Celaena discovers a conspiracy that reveals the king's cruel nature and the truth about her own lineage. As she uncovers more secrets, her relationships with Dorian and Chaol deepen, complicating her feelings and alliances. The book showcases intense action scenes, emotional turmoil, and a deeper exploration of Celaena’s character as she comes to terms with her identity and the dark magic surrounding her. The stakes escalate dramatically as Celaena realizes the extent of the king's power and the sacrifices she must make for those she cares about.