#20 The Wicked King by Holly Black

(Second in the Folk of the Air series)

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After the jaw-dropping revelation that Oak is the heir to Faerie, Jude must keep her brother safe. To do so, she has bound the wicked king, Cardan, to her, and made herself the power behind the throne. Navigating the constantly shifting political alliances of Faerie would be difficult enough if Cardan were easy to control. But he does everything in his power to humiliate and undermine her even as his fascination with her remains undiminished.

Exciting installment in the series. I can never tell where this story is going and maybe that's a good thing.