'I'll call Nelly, she knows me, she knows I can't have done this-'

'You can't do that. The police are watching her house ... you need to find someone else you can stay hidden with, someone more distant, unexpected.'

Erik and Joona end the call. The cars are standing still, the bridge is being opened. Three sailing boats are on their way out to the Baltic.

98.

Huddinge Prison is one of the largest secure facilities in the Swedish judicial system. Rocky Kyrklund is only suspected of basic narcotics offences and is therefore not subject to any particular restrictions, but he is regarded as a high escape risk.

The prison is a vast V-shaped, brown-brick building, with an entrance flanked by tall pillars. At the rear are two wings shaped like fans, each of whose top floors contain eight individual exercise areas.

Rocky is the only person who knows who the unclean preacher is. He's met him, spoken to him, and has seen him kill.

Joona has to hand over his keys and phone at the security check. They X-ray his shoes and jacket, and he is searched after pa.s.sing through the metal detector. A black-and-white c.o.c.ker spaniel circles him, sniffing for explosives and drugs.

The prison officer waiting for him at the door introduces himself as Arne Melander. As they head towards the lifts he tells Joona that he's a compet.i.tive angler, that he came third in the Swedish coa.r.s.e fishing championships at the start of the summer, and that he's heading to the Fyris River at the weekend.

'I went for bottom fishing,' Arne explains, pressing the lift b.u.t.ton. 'And used pink- and bronze-coloured maggots.'

'Sounds good,' Joona says seriously.

Arne smiles, his cheeks lift and grow rounder. He has a large grey beard and is wearing gla.s.ses and a dark-blue Nato sweater that's stretched tight across his big stomach.

His baton and alarm swing from his belt as they leave the lift and pa.s.s through the security doors. Joona waits quietly as the prison officer pulls his card through the reader and taps in the code.

They say h.e.l.lo to the duty officer, a white-haired man with a lazy eye and thin lips.

'We're running a bit late today,' the duty officer says. 'Kyrklund has just gone out for some air. But we can check if he wants to come back in.'

'Please do,' Joona says.

After the murder of prison officer Karen Gebreab the rules have been tightened, and no member of staff is allowed to be alone with any of their clients. The inmates are often desperate, in a state of upheaval after their crimes, the humiliation of their arrest, and the recognition of their failure in life.

Joona watches Arne Melander as he stands a little way off talking into a communications radio. He stares at the bare walls, the doors, the shiny linoleum floor and the coded locks.

Huddinge prison is evidently high security, totally enclosed, with reinforced doors and walls, entrance checks and camera surveillance. But the staff are only armed with batons.

Maybe they've got teargas or pepper spray, but no guns, Joona thinks.

A few years before Police Academy Joona was picked to join the paratroopers' newly formed special ops unit, where he was trained in military Krav Maga, with a particular focus on urban warfare and innovative weaponry.

He still finds himself automatically scanning for potential weapons each time he enters a room.

He's already spotted the stainless steel skirting boards and door-lintels in the prison.

The grooves on the heads of the screws have been planed off so they can't be removed with ordinary tools, but the boards have started to drop towards the floor with the pa.s.sage of time. Maybe the food trolleys have caught on them, or perhaps the floor-cleaner.

Joona has noticed that some of the skirting boards could be nudged off with his foot. If you wrapped your hands in some cloth, you could pull the whole length of skirting board off, bend it twice, and in twenty seconds create a sort of noose that could be wrapped round an opponent's neck and tightened using the protruding lengths of metal.

Joona remembers the Dutch lieutenant, Rinus Advocaat, a sinuous man with a scarred face and dead eyes, who demonstrated that sort of weapon, and showed how to control your enemy's movements and basically decapitate him by tightening the noose.

'He's on his way,' Arne says amiably to Joona.

Rocky is walking behind two prison officers. He's wearing pale green prison overalls and sandals, and has a cigarette tucked behind his ear.

'Thanks for cutting short your time outside,' Joona says, walking towards him.

'I don't like cages much anyway,' Rocky says, and clears his throat.

'Why not?'

'Good question,' he replies, and shoots Joona an interested glance.

'You're booked into a monitored interview room, number eleven,' Arne tells Joona. 'So I'll be sitting on the other side of the gla.s.s.'

'I remember the crayfish pots when I was little, at night ... It's around this time of year,' Rocky says.

They stop outside the door while Arne unlocks it.

'I used to shine my torch at the crayfish, and using just the beam I could force them into the pots,' Rocky goes on.

Interview room 11 is shabby, and contains a table, four chairs, and an internal phone to summon the prison staff.

The legs of the chairs are supposed to be unbreakable, but if you were to lay one of them on the floor, climb up on to the table and jump on to the curved back, the laminate would shatter and you could quickly fashion a shiv, a simple knife, out of it, Joona thinks.

'So the guard can see me through gla.s.s?' Rocky asks, nodding towards the dark window.

'It's just a security precaution.'

'But you're not frightened of me?' Rocky smiles.

'No,' Joona replies calmly.

The thickset priest sits down and his chair creaks beneath him.

'Have we met before?' he asks with a frown.

'At the Zone,' Joona says evenly.

'At the Zone,' Rocky repeats. 'Should I know where that is?'

'It was where the police arrested you.'

Rocky screws up his eyes and gazes into the distance.

'I don't remember any of that ... They say I had a load of heroin on me, but how could I have afforded that?'

'You don't remember the Zone? Sofa Zone in Hgdalen?'

Rocky purses his lips and shakes his head.

'An industrial unit with loads of sofas and armchairs, prost.i.tutes, people openly dealing heavy drugs, guns ...'

'Well, I've got a neurological injury from a car crash, I have trouble remembering things,' Rocky explains.

'I know.'

'But you want me to confess to the drugs offences?'

'I don't care about that,' Joona says, sitting down opposite him. 'You only have to say it wasn't your jacket, that you picked up a jacket you found on the floor.'

Neither of them speaks for a short while, and Rocky stretches out his long legs.

'So you want something else,' he says warily.

'You've mentioned a person you call the unclean preacher several times ... I need your help to identify him.'

'Have I met this preacher?'

'Yes ...'

'Is he a priest?'

'I don't know.'

Rocky scratches his beard and neck.

'I've no idea,' he says after a while.

'You described how he killed a woman called Natalia Kaliova, he chopped her arm off,' Joona goes on.

'A preacher ...'

'He was the one who murdered Rebecka Hansson.'

'What the h.e.l.l are you up to?' Rocky roars and stands up suddenly, toppling his chair behind him. 'I murdered Rebecka Hansson. Do you think I'm stupid or something?'

Rocky backs away, stumbles over the overturned chair and almost falls, throws his arm out and plants his large hand on the reinforced gla.s.s.

The prison officer comes in but Joona holds up a calming hand towards him as he sees several more guards running along the corridor.

'We don't believe you did it,' Joona says. 'Do you remember Erik Maria Bark?'

'The hypnotist?' Rocky says, licking his lips and brushing his hair back.

'He's found a woman who can give you an alibi.'

'And I'm supposed to believe that?'

'Her name is Olivia,' Joona says.

'Olivia Toreby,' Rocky says slowly.

'You started to remember under hypnosis ... and everything suggests that you were convicted of a murder that the preacher committed.'

Rocky comes closer to him.

'But you don't know who this preacher is?' he asks.

'No,' Joona replies.

'Because everything is locked inside my mashed-up brain,' Rocky says hollowly.

'Would you agree to be hypnotised again?'

'Wouldn't you if you were in my position?' he asks, and sits down again.

'Yes,' Joona replies honestly.

Rocky opens his mouth to say something, but falls silent and puts his hand to his forehead. One of his eyes has started to quiver, the pupil seems to be vibrating, and he leans forward, holding on to the table and breathing hard.

'b.l.o.o.d.y h.e.l.l,' he says after a while, and looks up.

His forehead is shiny with sweat, and he gazes up at Joona and the prison officers that have entered the room with a look of dreamy bemus.e.m.e.nt.

99.

Joona stops District Prosecutor Sara Nielsen in the middle of the steps outside the district court on Scheelegatan. Because he can't take Erik with him into the prison, he needs to persuade the prosecutor to release Rocky on bail in advance of his trial.

'I called you about Kyrklund,' he says, standing in front of her. 'He can't stay in prison.'

'That's for the district court to decide,' she replies.