‘Too true,’ said Foulnap. ‘She likes to pretend she’s the moderating influence at HiberTech, but she’s actually the opposite. Aurora enthusiastically embraced the intelligence-gathering possibilities like no other, and was by far and away the best at manipulating the Dreamspace. Could go into anyone’s head and take what she wanted. Go off-piste, so they said, and take the dream to wherever she wanted it to go. She could invoke nightmares, read your thoughts, delve into your emotions – anything. She’s extracted more secrets from sleeping suspects than anyone else alive, and has caused neurological damage to thousands. It was eventually her undoing.’

‘What do you mean?’

‘The story goes,’ said Dr Gwynne, ‘that fourteen years ago she suffered a moral conflict during a dream interrogation, where the last vestiges of her decent self struggled with what she was doing. Unable to reconcile the dissent within her own mind she split into two people: one containing the very worst bits of her, and the other with the  . . . well, faintly tolerable. They retired her from the military, put it about she was a Halfer and placed her in charge of HiberTech security. They thought all would be fine with the “faintly okay angels of her nature” side of her working behind the bar in the Wincarnis. Trouble was, Toccata wanted a career for herself and took a job as a Consul. Within ten years she was head of Sector Twelve’s Consul Service.’

‘Couldn’t HiberTech have just locked Toccata up or something?’ I asked.

‘It’s complicated,’ said Dr Gwynne, ‘because Aurora views her as a slightly loathsome younger sister who needs to be continuously looked after. Aurora has actually helped Toccata, put her in a position where they are in real-world conflict – part of their ongoing resolution and healing process, we think.’

‘Can they remerge?’ I asked, and they both shrugged.

‘The best neuroscientists are as confused as anyone over it,’ said Foulnap. ‘The simple answer is: no one knows. But this conflict you see out here in the real world? It’s probably ten times worse on the inside.’

I mused on this for a moment. It kind of made sense.

‘So  . . . what’s the plan?’ I asked.

‘We secure the cylinder,’ said Foulnap, ‘and find a Somnagraph to play it to the nightwalkers. We wake as many as possible, get them to Springrise and cause the biggest upset you’re ever likely to see.’

‘It sounds so simple when you say it like that,’ I said.

‘It’s more wishful thinking than plan,’ agreed Foulnap, ‘and more hope than objective. So: where’s the cylinder?’

‘At the Cambrensis.’

‘Good. We’ll need that – and a Somnagraph.’

I told them the ninth-floor device was most likely hidden in a steamer trunk in the room next to mine, and after discussing tactics, Foulnap said he should call Toccata.