nodded.
He knew that the boy, Mikael, had answered the phone just before he and his younger sister had left the house, but the number had been impossible to trace.
It had been unbearable, sitting there opposite the children’s parents. Joona said nothing, but was feeling more and more convinced that the children were victims of the serial killer. He listened, and asked his questions, but he couldn’t tell them what he suspected.
If the two children were victims of this serial killer, and they were correct in thinking that he would soon try to kill one of the parents as well, they had to make a choice.
Joona and Samuel decided to concentrate their efforts on Roseanna Kohler.
She had moved out to live with her sister in Gärdet, in north-east Stockholm.
The sister lived with her four-year-old daughter in a white apartment block at 25 Lanforsvägen, close to Lill-Jan’s Forest.
Joona and Samuel took turns keeping watch on the building at night. For a week, one of them would sit in their car a bit further along the road until it got light.
On the eighth day Joona was leaning back in his seat, watching the building’s inhabitants get ready for night as usual. The lights went off in a pattern that he was starting to recognise.
A woman in a silver-coloured padded jacket went for her usual walk with her golden retriever, then the last windows went dark.
Joona’s car was parked in the shadows on Porjusvägen, between a dirty white pickup and a red Toyota.
In the rear-view mirror he could see snow-covered bushes and a tall fence surrounding an electricity substation.
The residential area in front of him was completely quiet. Through the windscreen he watched the static glow of the streetlamps, the pavements and unlit windows of the buildings.
He suddenly started to smile to himself when he thought about the dinner he had eaten with his wife and little daughter before he drove out there. Lumi had been in a hurry to finish so she could carry on examining Joona.
‘I’d like to finish eating first,’ he suggested.
But Lumi had adopted her serious expression and talked to her mother over his head, asking if he was brushing his teeth himself yet.
‘He’s very good,’ Summa replied.
She explained with a smile that all of Joona’s teeth had come through, as she carried on eating. Lumi put a piece of kitchen roll under his chin and tried to stick a finger in his mouth, telling him to open wide.
His thoughts of Lumi vanished as a light suddenly went on in the sister’s flat. Joona saw Roseanna standing there in a flannel nightdress, talking on the phone.
The light went out again.
An hour passed, but the area remained deserted.
It was starting to get cold inside the car when Joona caught sight of a figure in the rear-view mirror. Someone hunched over, approaching down the empty street.
Joona slumped down slightly in his seat and followed the figure’s progress in the rear-view mirror, trying to catch a glimpse of its face.
The branches of a rowan tree swayed as he passed.
In the grey lights from the substation Joona saw that it was Samuel.
His colleague was almost half an hour early.
He opened the car door and sat down in the passenger seat, pushed the seat back, stretched out his legs and sighed.
‘OK, so you’re tall and blond, Joona … and it’s really lovely being in the car and everything. But I still think I’d rather spend the night with Rebecka … I want to help the boys with their homework.’
‘You can help me with my homework,’ Joona said.
‘Thanks,’ Samuel laughed.
Joona looked out at the road, at the building with its closed doors, the rusting balconies, the windows that shone blackly.
‘We’ll give it three more days,’ he said.
Samuel pulled out the silver-coloured flask of yoich, as he called his chicken soup.
‘I don’t know, I’ve been doing a lot of thinking,’ he said seriously. ‘Nothing about this case makes sense … we’re trying to find a serial killer who may not actually exist.’
‘He exists,’ Joona replied stubbornly.
‘But he doesn’t fit with what we’ve found out, he doesn’t fit with any aspect of the investigation, and—’
‘That’s why … that’s why no one has seen him,’ Joona said. ‘He’s only visible because he casts a shadow over the statistics.’
They sat beside each other in silence. Samuel blew on his soup, and beads of sweat broke out on his forehead. Joona hummed a tango and let his eyes wander from Roseanna’s bedroom window to the icicles hanging from the guttering, then up at the snow-covered chimneys and vents.
‘There’s someone behind the building,’ Samuel suddenly whispered. ‘I’m sure I saw movement.’
Samuel pointed, but everything was in a state of dreamlike peace.
A moment later Joona saw some snow fall from a bush close to the house. Someone had just brushed past it.
Carefully they opened the car doors and crept out.
The sleepy residential area was quiet. All they could hear were their own footsteps and the electric hum from the substation.
There had been a thaw for a couple of weeks, then it had started to snow again.
They approached the windowless gable-end of the building, walking quietly along the strip of grass, past a wallpaper shop on the ground floor.
The glow from the nearest streetlamp reached out across the smooth snow to the open space behind the houses. They stopped at the corner, hunched over, trying to check the trees as they got denser towards the Royal Tennis Club and Lill-Jan’s Forest.
At first Joona couldn’t see anything in the darkness between the crooked old trees.
He was about to give Samuel the signal to proceed when he saw the figure.
There was a man standing among the trees. He was as still as
