Jack is a prisoner. To save him, Sav Briar did the unthinkable: wed Kaspar—kelpie prince, once her safest harbor—and reclaimed the magic her sister stole.

Jack would burn the world to keep Sav breathing; captivity only sharpens the promise in his eyes. But love means nothing if Mab’s first law stands. Never fall in love with a human, and Jack is the one thing she can never have. But is he human?

When Kaspar learns where Sav’s heart truly lies, will he be ally or foe? Once the only fae Sav could trust, now Kaspar holds her true name, and with it the power to turn vows into chains.

Faerie frays at the edges, whole villages disappearing, and Sav must decide whether she’s willing to sacrifice herself and those she loves to save her world.