Some more information on the case from Wikipedia,
'On 24 November, five days before the discovery of the woman, a local 26-year old man was hiking with friends around the same area. He reported to have come across a woman of foreign appearance, her face completely distorted by fear. He noted that the woman was dressed elegantly, although not appropriately for being outdoors, let alone hiking in the hills. As they passed each other she formed her mouth as if to say something but appeared intimidated by two black-coated men who followed her. The men also had a foreign appearance.
The 26-year-old contacted the police after hearing that a young woman was found dead in the same area. He immediately recognized her from the composite sketches, but according to him the policeman with whom he spoke answered, "Forget her, she was dispatched. The case will never be solved", he followed the advice, waiting 32 years to tell the story publicly.'
To me this is case of international espionage and skullduggery on a grand scale, involving the co-operation of numerous governments.
Why?
The policeman used some very loaded language here. The word dispatch is one which is used in diplomatic and political circles, eg 'We dispatched an envoy' or 'We sent a dispatch'.
Had this officer been informed by those higher up in the Norwegian Government that this was some type of assassination of a known 'enemy' spy?
His words imply that she had been 'dispatched' to the next world after having been 'dispatched' to spy in Norway.
'Forget her. The case will never be solved.' Now, that's a statement telling of a previous conversation with someone from an intelligence agency who knows what's going on if ever I heard one!
Realistically, what truly dutiful officer of the law would make such a statement as this when referring to a blatant homicide unless he'd received a full briefing as to who she was and orders from much higher up to quieten everything down?
I can only assert that the policemen to whom this 26 year old man spoke was either an agent of some type of government intelligence department who was given the task of impersonating a police officer to the ends of silencing this young man or that as I previously stated, was told the facts by someone much higher up.
I believe she was on the run from her own government as she was being 'retired' for some reason or she had simply been tracked down by agents who knew what she was and wanted her activities ended.
Apparently, her dental work had been done in Latin America, so she could have been a victim of any number of South American fascist dictators or she was from Cuba or Russia and had simply had the work done in Cuba, (or South America), either way, it's leaning toward a possibly Communist base for her activities.
The fact that the woman had a terrified look on her face and yet did not say anything might be an example of the fact that the men following her had already told her that her fate was sealed and that if she encountered anyone on the track and alerted them to their task then they would also 'dispatch' that person.
If she was an spy and therefore trained in violence she would well have known that these men would have killed this hiker before he could react to her pleas for help.
Perhaps, as she knew she was about to exit this world, her refusing to speak was the last virtuous act of a person who had throughout their professional life as a spy had to leave all traces of 'normal' morality behind (such as a spy must)?
According to Wikipedia her fingerprints had been sanded off. What killer amateurish to try and burn a body with a meager amount of petrol would think so deeply as to bring along sandpaper to sand off the fingerprints? That defies logic. These were trained professionals.
There were traces of 50 sleeping pills in her system. She also had carbon monoxide poisoning and had been bludgeoned to death in the neck area.
Sounds like spies trying to create a long and convoluted trail of confusion for whoever came to investigate, such as their modus operandi usually is.
The official ruling to these brutalities was oddly, 'suicide' which, given the facts, reeks of a cover up.
Considering they found a list of addresses she'd been written in code, one must ask why would she encode these addresses?
Perhaps because she knew she was being hunted and these addresses were safe houses that she could go to, hence the need to disguise and guard the addresses with encoding?
She had said that she had 'Six months to see the most beautiful places in Norway'.
Perhaps she speculated that those chasing her would most likely catch up with her within six months?
According to Wikipedia,
'The last observation of the so-called Isdal woman was when she checked out of room 407 at the Hotel Marin. She paid in cash and then asked to be picked up by a taxi. The woman was described as 30–40 years old, 164 cm tall, wide hips, small eyes and good-looking. Hotel staff said the woman stayed mainly in her room, and seemed to be on guard. Another hotel guest told police that she smoked South State cigarettes, a native Norwegian brand.
One witness testified that she had overheard the woman while she was talking to a man across the hall in a hotel in Bergen and that she heard the woman say "Ich komme bald" (German: "I am coming soon").'
East German Communist agents perhaps?
Could it be that she had said this to the man who was one of her soon to be murderers and he was in her hotel room that day? Had he said to her,
"Hurry we must go to meet the taxi?" To which she replied, "Ich komme bald"?
Was it the taxi driver, an embedded East German Communist agent, who was the other killer?
All of those differing intoxicants in her blood stream discovered post mortem suggest to me that those who were to kill her, mercifully offered her the option of taking a large number of sleeping pills in order to kill herself instead of them killing her. I can imagine spies allowing another spy to swallow an overdose of sleeping pills as they are trained to swallow poison if captured.
Then, when unconscious the killer had realized that she was not yet dead, this process perhaps taking enough time for them to share a bottle of liqueur (which she had packed along with the sandwiches for a picnic that she had unsuspectingly arranged with these men who had not yet revealed to her their true professions or intentions).
(A vehicle must have been present as the fuel they poured over her dead body probably came from it.)
After not dying from the sleeping pills quickly enough for their liking and perhaps spooked by the young man they had passed, the killers became impatient and so placed her inside her car or their car or perhaps even a hire car that either she or they had been using, (I wonder if this was investigated as a possibility) where they attempted to asphyxiate her with the exhaust fumes from the vehicle (I'm assuming they had some type of hose with them as they needed something to siphon out the petrol from the car tank).
Then, as she had not yet expired, one or both of the assassins used the (military style as per trained spies) karate chop to the neck to break her neck?
Lastly, the fact that whoever killed her made no effort to hide her body indicating that they wanted her to be discovered, so that either
those they worked for could be certain that she'd been killed or they simply wished to try to make the crime look as though it was some amateur murderer, (which is why they doused her in petrol and lit her body to appear amateurish, as so many inexperienced killers seem to assume that cremation is an easily carried out practice involving a few gallons of fuel, when in reality it takes upwards of 6 hours under butane gas jets running in the thousands of degrees to reduce a corpse to ash.)
Either way, whoever killed her made no great efforts to conceal her body other than taking her out into the mountains and this was most likely purely to isolate her to get away from potential witnesses, which indicates they weren't particularly worried about concealing her corpse to prevent an investigation as they knew, 'The case will never be solved'.