Hollowpox The Hunt for Morrigan Crow- a Nevermoor book

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, exciting challenge: to master the mysterious Wretched Arts, and control the power that threatens to consume her.