A Victorian fantasy world filled with mythological immigrant creatures whose rich homelands were invaded by the empires of man. This growing immigrant population struggles to coexist with humans in the grimiest section of the city - forbidden to live, love, or fly with freedom. But even in darkness, hope lives, as a human detective, Rycroft Philostrate, and a refugee faerie named Vignette Stonemoss rekindle a dangerous affair despite an increasingly intolerant society. Vignette harbours a secret that endangers Philo's standing during his most important case yet: a string of gruesome murders threatening the uneasy peace of the Row. As Philo investigates, he reveals a monster no one could imagine.