Hollowpox: The Hunt for Morrigan Crow

In the third book of the Nevermoor series, Morrigan Crow and her friends have survived their first year as proud scholars of the elite Wundrous Society, helped bring down the nefarious Ghastly Market, and proven themselves loyal to Unit 919. Now Morrigan faces a new challenge: returning to her life in the Society whilst keeping her 'Wundersmith' powers in check. But 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.