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‘I’m not so sure that the job I did in Sydney was a model investigation.’ He attempted a wry smile. ‘As you perhaps remember, I ended up shooting the man.’

No laughter, not even so much as the suspicion of a smile. Harry was no future divisional commander.

‘We can imagine worse outcomes than that, Harry,’ Waaler said, looking at his Rolex again. ‘Many of you know the psychologist Stale Aune, to whom we have turned for expert advice on several cases. He’s agreed to come and give us a short presentation on the phenomenon of serial killing. For some of you this is nothing new, but going over some old ground won’t do any harm. He should be here at -’

All heads went up as the door swung open. The man who entered was panting loudly. Above the rotund stomach bursting out of a tweed jacket was a floppy orange necktie and glasses so small that you wondered whether it was possible to see through them at all. Beneath a shiny pate was a forehead glistening with sweat and beneath that a pair of dark, possibly dyed, but at any rate neatly tended eyebrows.

‘Talk of the devil…’ Waaler said.

‘And here he is!’ Stale Aune completed, pulling out a handkerchief from his breast pocket and drying his forehead. ‘And devilishly hot it is too!’

He went up to the end of the table and dropped his worn, brown leather bag onto the floor with a bang.

‘Good morning, lady and gentlemen. Nice to see so many young people awake at this time of day. Some of you I have met before, others of you have been spared.’

Harry smiled. He was one of those who had definitely not been spared. Harry first went to see Aune about his drinking problems many years ago. Aune was no expert on drug abuse, but Harry had to admit a relationship had developed between them that bordered on a friendship.

‘Notepads out, sluggards!’

Aune hung his jacket over a chair.

‘You look as if you’re at a funeral, and that’s probably true in some respects, but I want to see a few smiles before I leave here. That’s an order. And hang onto my coattails. I’m going to whistle through this.’

Aune grabbed a marker from the ledge under the flip chart and began to write at breakneck speed while speaking:

‘There is every reason to believe that serial killers have existed for as long as there have been men on earth to kill. However, many consider the so-called “Autumn of Terror” in 1888 the first serial killer case of modern times. It’s the first documented case of a serial killer with a purely sexual motive. The murderer killed five women before vanishing into thin air. He was given the epithet “Jack the Ripper”, but he took his real identity with him to the grave. Our most famous national contribution to the list is not Arnfinn Nesset, who, as you will all remember, poisoned twenty patients or so in the ’80s, but Belle Gunness who was that rare thing: a female serial killer. She left for America and married a weed of a man in 1902 and settled down on a farm outside La Porte in the state of Indiana. I say a weed of a man because he weighed seventy kilos and she weighed 120.’

Aune pulled lightly at the braces on his trousers.

‘If you ask me, her weight was just right.’

Ripples of laughter.

‘This pleasantly plump lady killed her husband, some children and an unknown number of suitors whom she lured to the farm through lonely heart advertisements in the Chicago press. Their bodies were discovered one day in 1908 when the farm burned down under mysterious circumstances. Among them was the burned and unusually voluminous torso of a woman with her head chopped off. The woman was presumably placed there by Belle to dupe investigators into believing it was her. The police received several reports from witnesses who said they had seen Belle in various places throughout America, but she was never found. And that is my point, dear friends. Unfortunately the cases of Jack and Belle are quite typical of serial killers.’

Aune finished writing with a round smack of his marker against the flip chart.

‘They do not get caught.’

The assembly looked at him in silence.

‘So,’ Aune said, ‘the concept of the serial murderer is just as controversial as everything else I’m going to tell you now. This is because psychology is a science that is still in its infancy and because psychologists are quarrelsome by nature. I’ll tell you what we know about serial killers – it’s much the same as what we don’t know. By the way, “serial killer” is a term which many competent psychologists consider meaningless since it is used to describe a set of mental illnesses that other psychologists claim do not exist. Is that clear? Well, some of you are smiling anyway, and that’s good.’

Aune tapped his index finger against the first point he had written up on the flip chart.

‘The typical serial killer is a white man between 24 and 40 years of age. As a rule he acts alone, but he can work with others, in a pair, for example. Brutality against the victim is an indication that he is acting alone. The victims can be anyone, though generally they fall into the same ethnic group as the killer, and in exceptional cases they may be known to him.

‘Usually he finds the first victim in an area he knows well. In the public imagination there are always special rituals connected with the murders. This is not true, but when rituals do occur, it is often in connection with a serial killing.’

Aune pointed to the next point where he had written

PSYCHOPATH/SOCIOPATH.

‘However, the most characteristic trait of the serial killer is that he’s American. Only God – and perhaps a couple of psychology professors at Blindern – knows why. That’s why it is interesting that the people who know most about serial killings – the FBI and the American legal profession – distinguish between two types of serial murderer: the psychopath and the sociopath. The professors I mentioned believe that both the distinction and the concepts stink, but in the homeland of the serial killer most law courts follow the McNaughten Rules which decree that it is only the psychopath who does not know what he’s doing while committing the crime. The psychopath, therefore, unlike the sociopath, escapes a prison sentence or – as is probably the case in God’s own country – execution. Apropos serial killers, it is my opinion that, hm…’

He sniffed at the marker pen and raised a surprised eyebrow.

Waaler put up his hand. Aune nodded.

‘What sentence is apportioned is very interesting,’ Waaler began, ‘but first we have to catch him. Have you any practical advice we can use?’

‘Are you crazy? I’m a psychologist, aren’t I?’

Laughter. Aune, gratified, bows.

‘Yes, I’ll be coming to that, Inspector Waaler. Let me first say that if any of you are already becoming impatient, you have a tough time ahead of you. From experience, nothing takes as long as catching a serial killer. If they are the wrong type, at any rate.’

‘What’s the wrong type?’ It was Magnus Skarre’s question.

‘First of all, let’s have a look at how the people who draw up psychological profiles for the FBI distinguish between psychopaths and sociopaths. The psychopath is often a maladjusted individual without a job, without any education, with a criminal record and a variety of social problems. Unlike the sociopath, who is intelligent, apparently successful and living a normal life. The psychopath stands out and easily falls under suspicion, whereas the sociopath can disappear in the crowd. It always comes as quite a shock to neighbours and friends when a sociopath is uncovered. I was talking to a psychologist who works as a profiler for the FBI and she told me that the first thing she considered was the timing of the killings. Killing takes time of course. A useful lead for her was whether the killings had taken place on weekdays, at weekends or on national holidays. The latter would suggest that the killer had a job and would increase the likelihood that you were dealing with a sociopath.’

‘So if our man kills during the national holidays it suggests that he has a job and is a sociopath?’ Beate Lonn asked.