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

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 compl