Defeated but not vanquished, the foes of light have retreated. But victory came at a terrible cost to Elora Walker, with her friends lost and scattered. Eleven months later and just seventeen, she commands her own Vanguard quad but struggles with a past that won't release her and a future she hesitates to embrace. The barriers between worlds continues to weaken, Dark Seekers are emboldened, and David still plans to engulf humanity in eternal night. Elora means to end the threat once and for all but dreads the personal consequences. Will saving the world demand the ultimate sacrifice? And who must pay it?