War looms on the horizon, and Aelin Galathynius's journey to the throne has only just begun. Loyalties are fragile—broken and bought—while friends are lost and gained in a world teetering on the brink of chaos.

With her heart sworn to the warrior-prince by her side and her fealty pledged to the people she is determined to save, Aelin must delve deep into the depths of her power to protect those she loves. But as monstrous horrors from the past resurface and dark forces threaten to claim her world, salvation may rest on a desperate quest that could cost her everything.

As magic-wielders clash with those without, Aelin faces an impossible choice: what—and who—is she willing to sacrifice to prevent the collapse of Erilea? Will her decisions save her world, or doom everything she holds dear?