I signed into the log book and availed myself of one of the noddy suits draped over a folding chair. Once I was kitted out I walked over to where Stephanopoulos was supervising the Exhibits’ officer as he in turn supervised the forensics team that was swarming over the far end of the platform.

‘Morning, boss,’ I said. ‘You rang?’

‘Peter,’ she said. Around the Met she’s rumoured to keep a collection of human testicles in a jar by her bed – souvenirs courtesy of the men unwise enough to express a humorous opinion about her sexual orientation. Mind you I’ve also heard that she has a big house outside the North Circular where she and her partner keep chickens but I’ve never worked up the nerve to ask her.

The guy lying dead at the end of platform 3 had once been handsome but he wasn’t anymore. He was lying on his side, his face resting on his outflung arm, his back half curled and his legs bent at the knees. Not quite what the pathologists call the pugilistic position, more like the recovery position I’d been taught in first aid.

‘Was he moved?’ I asked.

‘The station manager found him like that,’ said Stephanopoulos.

He was wearing pre-faded jeans, a navy suit jacket over a black cashmere roll-neck. The jacket was good-quality fabric cut really well – definitely bespoke. Weirdly though, on his feet he wore a pair of Doctor Martens, classic type 1460 – work boots, not shoes. They were encrusted with mud from their soles to the third eyelet. The leather above the mud line was matt, supple, uncracked – practically brand-new.

He was white, his face pale, straight nose, strong chin. Like I said, probably handsome. His hair was fair and cut into an emo fringe that hung lankly across his forehead. His eyes were closed.

All of these details would already have been noted by Stephanopoulos and her team. Even as I crouched beside the body half a dozen forensics techs were waiting to take up samples from anything that wasn’t firmly nailed down and behind them another set of techs with cutting tools to get all the stuff that was. My job was a bit different.

I put my face mask and protective glasses on, got my face as close to the body as I could without touching it and closed my eyes. Human bodies retain vestigia very badly but any magic powerful enough to kill someone directly, if that was what had happened, is powerful enough to leave a trace. Just using my normal complement of senses I detected blood, dust and a urine smell that was definitely not foxes this time.

As far as I could tell there were no vestigia associated with the body. I pulled back and looked round at Stephanopoulos. She frowned.

‘Why’d you call me in?’ I asked