The year is 1860, and the world has been rocked by Change.The discovery of the Distillation has inspired technological marvels beyond anything previously conceived—but the same crystal that drives these mechanical wonders can also change the unwary into monsters. Lives have been altered, fortunes have been won and lost, and society will never be the same.Working in London as an investigator, at the center of this time of opportunity and danger, Hector Kingsley takes on two new mysteries. Between the attempted murder of a local lord and the threats against a school full of Changling children, he has plenty to occupy his time. He soon finds himself plunged into a dangerous web of plots which threaten his life and those of his friends. In a city of werewolves and golems, inventions and intrigue, he must find the culprits responsible—or face the horrible consequences of their schemes.