A magical serial killer is on the loose, and gelatinous, otherworldly creatures are infesting the English countryside. Which is making life for the Ministry of Occultism difficult, because magic is supposed to be their best kept secret.

After centuries in the shadows, the Ministry is forced to unmask, exposing the country's magical history - and magical citizens - to a brave new world of social media, government scrutiny, and public relations.

On the trail of the killer are the Ministry's top agents: a junior operative with a photographic memory (and not much else), a couple of overgrown schoolboys with godlike powers, and a demonstrably insane magician.

But as they struggle for results, their superiors at HQ must face the greatest threat the Ministry has ever known: the forces of political correctness....