I took a deep breath, extended my arm and opened my fist – nothing happened. Nightingale didn’t laugh but I would have preferred it if he had. I took another breath, tried to ‘shape’ my mind, whatever that meant, and opened my hand again.

‘Let me demonstrate again,’ said Nightingale. ‘And then you follow.’

He created the werelight, I felt for the shape of the forma and tried to replicate it. I still failed to create my own light, but this time I thought I felt an echo of the forma in my mind like a snatch of music from a passing car.

We repeated the exercise several times until I was certain I knew what the shape of the forma was, but I couldn’t find the shape in my own mind. The process must have been familiar to Nightingale because he could tell what stage I was at.

‘Practise this for another two hours,’ he said. ‘Then we’ll stop for lunch and then two more hours after that. Then you can have the evening off.’

‘Just do this?’ I asked. ‘No learning of ancient languages, no magic theory?’

‘This is the first step,’ said Nightingale. ‘If you can’t master this then everything else is irrelevant.’

‘So this is a test?’

‘That’s what an apprenticeship is,’ said Nightingale. ‘Once you’ve mastered this forma then I can promise you plenty of study. Latin of course, Greek, Arabic, technical German. Not to mention you’ll be taking over all the legwork on my cases.’

‘Good,’ I said. ‘Now I’m incentivised.’

Nightingale laughed and left me to it.

4 By the River

By the River

There are some things you don’t want to be doing less than ten minutes after waking up, and doing a ton down the Great West Road is one of them. Even at three in the morning with the spinner going and a siren to clear the way and the roads as empty of traffic as London roads ever get. I was hanging onto the door-strap and trying not to think about the fact that the Jag, with its many vintage qualities of style and craftsmanship, was sadly lacking in the airbag and modern crumple-zone department.

‘Have you fixed the radio yet?’ asked Nightingale.

At some point the Jag had been fitted with a modern radio set, which Nightingale cheerfully admitted he didn’t know how to use. I’d managed to get it turned on but got distracted when Nightingale put us around the Hogarth Roundabout fast enough to smack my head against the side window. I took advantage of a relatively straight bit of road to key into Richmond Borough Command, which was where Nightingale said the trouble was. We caught the tail end of a report delivered in the slightly strangulated tone adopted by someone who’s desperately trying to sound like they’re not panicking. It was something about geese.

‘Tango Whiskey Three from Tango Whiskey one: say again?’