Salvation by Erica Stevens (The Captive #4)

Imprisoned by Caleb and at the mercy of the king, Aria is determined not to let them break her. However, the more atrocities she witnesses, the more she realizes there are some horrors no one can withstand, and sometimes survival isn’t always the best option.
Tormented by the loss of Aria, Braith is forced to choose between his need to rescue her, and the impending rebel war he’s been chosen to lead. Fighting against the darkness which threatens to drag him into its tempting depths, Braith struggles not to become like the one thing he hates the most, his father.
Faced with their own separate challenges, Aria and Braith must come to terms with who they are, what they want, and the likelihood that they can never be together as the inevitable war looms on the horizon. A war that all of them will fight but not all of them will survive.