a new, exciting challenge: to master the mysterious Wretched Arts of the Accomplished Wundersmith, and control the power that threatens to consume her. Meanwhile, a strange and frightening illness has taken hold of Nevermoor, turning infected Wunimals into mindless, vicious Unnimals on the hunt. As victims of the Hollowpox multiply, panic spreads. There are whispers - growing louder every day - that this catastrophe can only be the work of the Wundersmith, Ezra Squall. But inside the walls of Wunsoc, everyone knows there is a new Wundersmith - one who's much closer to home. With Nevermoor in a state of fear and the truth about Morrigan threatening to get out, the city she loves becomes the most perilous place in the world. Morrigan must try to find a cure for the Hollowpox, but it will put her - and everyone in Nevermoor - in more danger than she could have imagined.