Like deep dark water, it pulls them down. The faint fire of magic within them flickers and dies. Their eyes turn black as night. They are nightborn now.

Grace Marchant has been many things: streetwise orphan, rebellious servant, and now beloved companion of Prince Bastien, heir to the throne of Larelwynn. But their sunlit happiness is not destined to last. The golden magic which brought them together in purest passion is threatened by strange and ancient forces. Innocent people are becoming nightborn – cruel, deadly, unrecognisable to their loved ones – and these two young lovers are the only ones with power enough to stop it.

In times of peace, striking a deal with their closest enemy would be unthinkable, but now their only hope is to ally with the neighbouring Valenti royal family: manipulative, cunning, and always with an eye on the Larelwynn throne. The partnership comes at a devastating price… if Grace wants to defeat the nightborn, she must watch Bastien marry a Valenti princess.