‘No thanks, you sort out whatever that is between yourselves,’ Molander said, his eyes glued to the screen.

‘I’m aware we can’t build our entire case on a smile,’ Lilja said. ‘But walking around grinning, given what had just happened…’ She shook her head.

‘Maybe he didn’t know what had happened.’

‘Klippan, come take a look at this,’ Molander said.

Klippan went over to Molander, giving Lilja a chance to press play and return to the sea of people on her screens. And almost immediately, the bottom left screen caught her attention. It was not unusual for her to spot something now and then that made her rewind and review the tape frame by frame. But this time, it felt different.

‘See that red Seat?’ Molander continued, pointing to the red car whose rear end was just visible at the left edge of his screen.

‘Yes, what about it?’

‘For one, it’s not parked within the lines, but look at this.’

Suddenly, the rear lights came on and then the car indicated and disappeared out of shot.

‘As you can see, it’s 8.20, which tallies with the time of the murder.’

‘Where’s the camera?’

‘It’s by a cashpoint on Norra Stationsgatan, just over fifty feet away.’

Lilja couldn’t see the man’s face, because he’d got off the train with his eyes lowered. And the camera was shooting from above. But the blindingly white trainers, the pulled-up jeans and the beige jacket were enough to make her sure.

‘Try backing up and see if you can zoom in on the plates,’ Klippan said.

‘No need,’ Molander said. ‘I already did.’

‘And?’

‘HUT 786. It’s a rental from Hertz on Gustav Adolfsgatan in Helsingborg.’

Klippan turned to Lilja. ‘I don’t know about you, but to my mind, this is exactly the kind of thing that’s worth looking into. I myself have a long list already, so if you wouldn’t mind handling this one, I’d be ever so grateful.’

‘Sure,’ Lilja replied. ‘But in case you’re interested, I’ve found him.’

‘You have?’ Klippan came over to her and leaned in closer to the screen where the picture was paused to show a man with blue jeans and a beige jacket from behind. ‘You can’t even see his face.’

‘It’s him, okay. I know it’s him. Just look at this.’ With a few quick commands, she clicked over to another clip on the next screen. ‘This is from the mall when I was chasing him.’ She dragged the clip’s time marker to 13.06.2012 11.42.53 and pressed play.