Estranged from her powerful family, Lilith Leviathan finds refuge in Nineveh, a district in the city of Eden devoted to sin. There, she uses her magic to steal for a living, attracting the attention of the five governing families as well as the church, which expects women to remain pious and silent. When Lilith comes into possession of a beautiful blade, she thinks all her worries are over, until her usual buyer dies while inspecting it.