Before the Eternal Night or the Huntress, there was a deal with darkness. Isoldra Maan is drowning in debt—specifically 250 souls deep. For the last five years she has been working off her payment to the Lord of Lost Souls and notoriously depraved fallen god,Haalarcus. But when a dark power awakens and a heretic rises in the barren fields of Helencort, the divines strike a deal with the Dark Lord in exchange for her services. Isoldra is forced to partner with a self-righteous watcher, who fills her with as much irritation as he does forbidden desire, to track down this evil and deliver it to the gods. With a series of plagues threatening to tear apart the world, Isoldra is forced to choose between the one who holds her heart and the one who claims her soul. But when even death is not the end, how far will she go to save them all?