One forbidden wish. One stolen life. One train that never stops collecting. When Lila Harrow boards the Nightjar on a frozen Christmas Eve, she discovers her mother traded her father's life for fifteen extra years—and now the bill has her name on it. To break the curse, Lila must confront the woman who birthed her, the passengers doomed to ride forever, and the ravenous entity wearing her mother's face. Some debts can't be paid. Some can only be passed on—or burned to ash.