After Tristan Grandark, an Inquisitor of the Illuminati, was excommunicated and sentenced to banishment for accidentally killing a fellow Inquisitor, he lived a normal life as a mortal, happily married to a mysterious lady named Lira.

Until Lira was killed by a demon, and her soul, taken.

As Tristan descends to the underworld in search of Lira's killer and her soul, he slowly uncovers truths, conspiracies, and links tying his and Lira's destinies to the fate of the cosmos.