Outside Cinderside, the capital city of Eldfall, corruption and greed triggered the eruption of Mount Imber. In the chaos of the fallout, the authoritarian Cruces Order seized control. They built massive walls around New Cinderside to keep the surviving population contained. Among that population were many oppressed and forgotten groups, including witches. When a member of a rebel organisation called Sparrowhawk gets lost in the Witches' Quarter, a new alliance may offer the downtrodden of New Cinderside a glimmer of hope.