My name is Peter Grant and until January I was just probationary constable in that mighty army for justice known to all right-thinking people as the Metropolitan Police Service (and as the Filth to everybody else). My only concerns in life were how to avoid a transfer to the Case Progression Unit — we do paperwork so real coppers don't have to — and finding a way to climb into the panties of the outrageously perky WPC Leslie May. Then one night, in pursuance of a murder inquiry, I tried to take a witness statement from someone who was dead but disturbingly voluable, and that brought me to the attention of Inspector Nightingale, the last wizard in England. Now I'm a Detective Constable and a trainee wizard, the first apprentice in fifty years, and my world has become somewhat more complicated: nests of vampires in Purley, negotiating a truce between the warring god and goddess of the Thames, and digging up graves in Covent Garden... and there's something festering at the heart of the city I love, a malicious vengeful spirit that takes ordinary Londoners and twists them into grotesque mannequins to act out its drama of violence and despair. The spirit of riot and rebellion has awakened in the city, and it's falling to me to bring order out of chaos — or die trying.

I was my dad's vinyl-wallah: I changed his records while he lounged around drinking tea, and that's how I know my Argo from my Tempo. And it's why, when Dr Walid called me to the morgue to listen to a corpse, I recognised the tune it was playing. Something violently supernatural had happened to the victim, strong enough to leave its imprint like a wax cylinder recording. Cyrus Wilkinson, part-time jazz saxophonist and full-time accountant, had apparently dropped dead of a heart attack just after finishing a gig in a Soho jazz club. He wasn't the first. No one was going to let me exhume corpses to see if they were playing my tune, so it was back to old-fashioned legwork, starting in Soho, the heart of the scene. I didn't trust the lovely Simone, Cyrus' ex-lover, professional jazz kitten and as inviting as a Rubens' portrait, but I needed her help: there were monsters stalking Soho, creatures feeding off that special gift that separates the great musician from someone who can raise a decent tune. What they take is beauty. What they leave behind is sickness, failure and broken lives. And as I hunted them, my investigation got tangled up in another story: a brilliant trumpet player, Richard 'Lord' Grant — my father — who managed to destroy his own career, twice. That's the thing about policing: most of the time you're doing it to maintain public order. Occasionally you're doing it for justice. And maybe once in a career, you're doing it for revenge.