Just as mechanical pets are becoming all the rage in society, suddenly, without warning, decent citizens are transforming into wild, animalistic "Wolfmen" that themselves are made of strange clockwork machinery. Hired by the widow of one of these Wolfmen to clear her family name, and suddenly a target herself, Kit must navigate the protective attentions of deathmage Lucien Dredmore and Chief Inspector Thomas Doyle if she's to remain at liberty to solve the mystery of the mechanized Wolfmen and their link to a mysterious figure running a local hellfire club.