An assassin. A cursed prince. A night that will change everything. Kaelin Thorne has spent her life in shadows, trained to kill, hardened by loss, and driven by vengeance. Prince Aurelion Drest bears a curse that haunts every heartbeat-one that could destroy the kingdom and everyone he loves. When Kaelin infiltrates Obsidian Keep to end his life, neither expects the sparks that ignite instead: flashes of grief, glimpses of humanity, and a pull they cannot resist. Blood and magic entwine, forcing them into an uneasy alliance where every step is a gamble, every touch a temptation, and every secret a threat. In a world of living forests, whispering ruins, and merciless magic, their hatred may turn to desire-and their desire may be the only thing strong enough to survive the darkness closing in.