‘Sir, the bad news is that only half the CCTV cameras in this place are operational,’ said Hitchens. ‘The others are dummies.’

Kessen cursed quietly. ‘And Level 8?’

‘One of the dummies.’

‘Damn and blast.’

‘The camera at the exit is working, sir. We can get registration numbers for any vehicles that left the car park after the attack.’

‘He wouldn’t have been so stupid,’ said Kessen. ‘Ten to one he was on foot.’

‘That would make the job much more difficult than just bundling someone into a vehicle.’

‘But it would be the only way to avoid the cameras. So what about pedestrian access?’

‘Two flights of stairs, one at either end. Lifts at the entrance into the shopping centre. Also, the attacker could have made his way down through the levels via the car ramps. That would be a dangerous thing to do during the day, when it’s busy. But after seven o’clock it would be so quiet that he could do it easily. And he’d have heard any car coming a long way off. Noises really travel in here, have you noticed?’

‘Yes, I have.’

‘But wouldn’t the operative cameras pick him up on some of the levels, at least?’ said Fry.

‘Yes, you’re right, DS Fry.’ Kessen looked thoughtful. ‘Who’s talked to the attendant?’

‘The FOAs. He’s got his supervisor here with him now, too. He called his head office as soon as we arrived.’

‘We need to talk to him again,’ said Kessen. ‘If it was so quiet in here last night, it makes me wonder what exactly the attendant was doing down there.’

Hitchens wiped his face with a handkerchief. He was getting very unfit if he couldn’t walk up a few flights of stairs without risking a heart attack.

‘At least he heard the scream,’ he said.

‘Oh yes, the scream.’

‘It helps us with the timing.’

‘Well, it’s a pity he wasn’t quicker off the mark getting up here, instead of staring at his little screens wondering if he was on the wrong channel.’

‘According to his initial statement, there was no one around when he did come up to check, so he thought it must be kids messing around outside.’

‘And then he went back to his tea break, no doubt,’ said Kessen.

Hitchens shrugged. ‘Also, the mobile phone network recorded the logging-off signal from Mrs Birley’s phone. But I don’t think that will help us much, in the circumstances.’

The smashed phone had been bagged by the SOCOs, along with the bits of broken plastic scattered across Level 8 by the tyre of a Daihatsu 4x4 that had driven over it. The SIM card would identify the phone definitely, but it matched the description given by Geoff Birley – a Nokia with a soft leather case and a red fascia.

Fry walked to the outside wall of the car park and looked over the ledge at the buildings in Clappergate. Far below, a group of youths wearing rucksacks went by with their skateboards, whistling between their teeth as they entered the shopping precinct. She tugged at the wire mesh, but it didn’t shift an inch.