In the belly of the beast, strategy is useless.

Genevieve Drake is on a dangerous mission to find the soul collector, Lethe, and enter the deepest, darkest level of the underworld. No one has ever returned alive from the belly of a soul collector, but she will let nothing stop her from going after the precious treasure Lethe stole from her.

As she is tested against demon spawn and foul creatures of the underworld, each triumph strengthens her Vessel power—and drags her closer to a breaking point that could forever doom her to the abyss.

Meanwhile, with the full prophecy hurtling toward completion, the Dominus Daemonum strategize for the day Gen will battle Prince Bamal’s Vessel to the death, when the Great War between heaven and hell will begin.

But Bamal has a secret weapon. When he reveals it—and Thomas reveals his own hidden agenda—Gen may not have the strength to resist the temptation to fall into darkness, forsaking the fate of the world for her broken heart.