Stephanie Garber's Caraval meets Kendare Blake's Three Dark Crowns and Sarah J. Maas's A Court of Thorns and Roses in this gripping, dark fairytale fantasy about two girls who must choose between saving themselves, each other, or their sinking island city.

Every year on St. Walpurga's Eve, Caldella's Witch Queen lures a boy back to her palace. An innocent life must be sacrificed on the full moon to keep the island city from sinking.
Lina Kirk is convinced her brother is going to be taken this year. To save him, she enlists the help of the mysterious Thomas Lin, the boy she secretly loves, and the only person ever to escape from the palace. But they draw the queen's attention, and Thomas is chosen as the sacrifice.
Queen Eva cast away her heart when her sister died for the boy she loved. Now, as queen, she won't make the same mistake. She's willing to sacrifice anyone if it means saving the city.
When Lina offers herself in exchange for Thomas's freedom, the two girls await the full moon together. But Lina is not at all what Eva expected, and the queen is nothing like Lina envisioned. As water floods Caldella's streets and the dark tide demands its sacrifice, they must choose who to save- themselves, each other, or the island city relying on them both.