‘Well done.’ Relief soared in me, and I yanked the cap off a board-marker, rubbed ‘UnSub’ out with my thumb and wrote KELLY TURNER above her photograph. ‘Finally, she has a name. Can you pass that on to the analysts? They’ll check Kelly’s social media. Registers, hospitals, social security. The lot.’

‘Thanks, Boss. Will do.’ She shone with pride. ‘We’ve had a development from H-2-H too.’

‘Go on.’

‘An eyewitness saw a young woman climb into one of the back gardens on the soup shop side of the street at lunchtime on Friday. Old bloke called Arthur Monro. He’s in his seventies and often walks his dog along the alley.’ She checked her notepad. ‘He isn’t a hundred per cent sure it was the soup shop back garden, as they all have tall panel fences and wooden gates, and from a distance many of them look the same. He said he’s seen her before. I’m following this up.’

‘Maybe she’s Kelly Turner?’ Alexej’s face was hopeful. ‘I’ve got progress too. We’ve received the CCTV from Alchemia and the techs are looking for whoever carved the star on Rosa’s shop, and we now have a description of the male that the shift-worker has seen in the alley behind Rosa’s shop.’ He pointed at an e-fit image on the board. ‘IC1. Twenties, over six feet and thin.’

‘That’s definitely not Kenny. He’s in his forties.’ I caught the disappointment in Jackie’s tone.

‘No, but I do have an update on Kenny,’ said Alexej. ‘He’s the person who’s been posting on LfA as “s10s”.’

‘I bloody knew it,’ Jackie screeched. ‘I knew that low-life scumbag was involved in all this. We’re going to get him. I can feel it.’

Hayes’ surly features scowled from his mugshots on the board. Next to him, his teenage brother’s face looked equally angry.

‘They’ve tracked Kenny’s username to an email address and regular internet activity.’ He paused. ‘There’s been private messaging between Kenny and Frazer. Frazer is the person that people first have contact with and s10s is the person who provides the flash mob venue and time. We’re still working on Frazer’s email address. He’s either extremely clever at masking his identity or knows someone who is. His email goes through a proxy system and three re-routers, one of which is via Columbia.’

Dan looked at the ceiling in frustration.

‘It doesn’t mean any connection with Columbia necessarily,’ Alexej continued. ‘There are various countries which people use to divert their ISPs to, and Columbia is one of them.’ He took a breath. ‘Unfortunately, people often share user profiles and log-ins on these forums. They know it makes it harder for their activity to be traced. Frazer’s first post since before the arson, the one he put up yesterday, said this: