Prisoner throne by Holly Black

The Setup: Prince Oak of Elfhame is imprisoned in the icy north, held captive by the girl he loves: Wren, the volatile and vengeful Queen of the Court of Teeth .

The Conflict: With his sister, High Queen Jude, and King Cardan willing to go to war to save him, Oak faces an impossible choice . He can try to regain the trust of Wren—who believes he betrayed her—or stay loyal to his family and help them destroy her reign .

The Stakes: As war looms and treachery lurks everywhere, Oak must rely on his charm, cunning, and the dangerous truth of his nature as a gancanagh (a love-talker who can compel devotion with his voice) to survive . He must decide who to doom, knowing his wit won't be enough to save everyone he loves