Queen of Shadows (Throne of Glass #4) by Sarah J. Maas
Aelin returns to Rifthold and finds that Aedion has been caught and is imprisoned for treason and after three days Aedion will be executed.she gets to hear this news through Arobynn. He tells he will help her is she will bring a valg creature for him. He tells her where Chaol is, Aelin with the help of Nesryn finds Chaol. Even though chaol does know how to restore magic but decides not to share this secret with Aelin. . Aelin blows up their cover and takes favors from the guards while rescuing Aedion. In the Prison, Aedion is suffering from pain because of his injuries but he wishes to succumb to the fever and infection.Dorian notices his sickness and treats him so that he can be presented for his execution. Aelin enters with a troupe of dancers and they burn down the banquet hall and help Fleeing Aelin. Dorian approaches and he tries to kill Aedion. Manon’s old witch grandmother is preparing a weapon for the king. Manon meet Aelin and they get into an epic fight during which Manon is actually saved by Aelin. An Epic battle takes place in the glass castle which kills the king.Finally, at the end of the book, it turns out that he was possessed by a demon the entire time.