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-t...