The question was: what?

It had been a hectic time, but Wallander had organised his troops well and had not hesitated to take on the most boring work himself -which often proved to produce the most interesting information. They had gone through the story of Harderberg's life, from the day he was born, the son of an alcoholic timber merchant in Vimmerby, when he was known as Hansson, to the present day when he was the driving force of an enterprise with a turnover of billions in Sweden and abroad. At one point during the laborious exercise, wading through company reports and accounts, tax returns and share brochures, Svedberg said: "It's simply not possible for a man who owns as much as this to be honest." In the end it was Sven Nyberg, the surly and irritable forensic specialist, who gave them the information they needed. As so often happens, it was pure coincidence that he stumbled upon the tiny crack in Harderberg's immaculately rendered wall, the barely visible fault they had craved. And if Wallander, despite his exhaustion, had not picked up on a remark Nyberg made as he was on his way out of Wallander's office late one night, the opportunity might have slipped away.

It was nearly midnight on Wednesday and Wallander was poring over a resume Hoglund had drawn up on Harderberg's worldly possessions when Nyberg belted on the door. Nyberg was not a discreet person; he stamped down corridors and he belted on doors, as if he were about to make an arrest, when he visited his fellow officers. That night he had just completed the forensic lab's preliminary report on the mine in Mrs Duner's garden and the blowing up of Wallander's car.

"I thought you would want the results right away," he said after flopping down on one of Wallander's visitors' chairs.

"What have you got?" Wallander said, peering at Nyberg with red-rimmed eyes.

"Nothing," Nyberg said.

"Nothing?"

"You heard." Nyberg was irritated. "That's also a result. It's not possible to say for certain where the mine was manufactured. We think it might be from a factory in Belgium, a company called Poudreris Reunie de Belgique or however you p.r.o.nounce it. The explosive used suggests that. And we didn't find any splinters, which means that the force of the mine was upwards. That also suggests Belgian in origin. But it could also have been from somewhere else entirely. As for your car, we can't say definitely that there was explosive material in your petrol tank. In other words we can't say anything at all for sure. So the result is nothing."

"I believe you," Wallander said, searching through his pile of papers for a note he had made about what he wanted to ask Nyberg.

"And that Italian pistol, the Bernadelli, we don't know any more about that either," Nyberg said while Wallander made notes. "There's no report of one having been stolen. All the people registered in Sweden as owning one have been able to produce it. Now it's up to you and Per keson to decide whether we should call them all in and give them a test firing."

"Do you think that would be worth it?"

"Yes and no," Nyberg said. "Personally, I think we ought to run a check on stolen Smith & Wessons first. That'll take a few more days."

"We'll do as you suggest, then," Wallander said, making a note. Then they went on going through Nyberg's points.

"We didn't find any fingerprints in the solicitors' offices," Nyberg said. "Whoever shot Sten Torstensson didn't press his thumb helpfully on the window pane. An inspection of the threatening letters from Lars Borman produced negative results as well. But we did establish that it was his handwriting. Svedberg has samples from both of his children."

"What did they say about the language?" Wallander asked. "I forgot to ask Svedberg."

"What do you mean, the language?"

"The letters were very oddly phrased."

"I have a vague memory from one of our meetings that Svedberg said that Borman was word blind."

"Word blind?" Wallander frowned. "I don't remember hearing that."

"Maybe you'd left the room to fetch more coffee?"

"Could be. I'll have a word with Svedberg. Have you got anything else?"

"I went to give Gustaf Torstensson's car the once-over," Nyberg said. "No fingerprints there either. I examined the ignition and the boot, and I've spoken to the pathologist in Malmo. We're almost certain that he didn't get the fatal blow to the back of his head by hitting it against the car roof. There's nothing anywhere in the bodywork that matches the wound. So it's more probable that somebody hit him. He must have been outside the car when it happened. Unless there was somebody in the back seat."

"I thought about that," Wallander said. "The likelihood is that he stopped on the road and got out of the car. Somebody came up behind him and hit him. Then the accident was faked. But why did he stop in the fog? Why did he get out?"

"I couldn't say," Nyberg said.

Wallander put down his pen and leaned back in his chair. His back ached, and he needed to go home and get some sleep.

"The only thing of note we found in the car was a plastic container made in France," Nyberg said.

"What was in it?"

"Nothing."

"Why is it interesting, then?"

Nyberg shrugged and got up to leave. "I've seen a similar one before. Four years ago. When I was on a study visit at the hospital in Lund."

"The hospital?"

"I have a good memory. It was identical." "What was it used for?"

Nyberg was already at the door. "How should I know?" he said. "But the container we found in Torstensson's car was chemically clean. Only a container that's never contained anything anything could be as clean as that one. could be as clean as that one.

Nyberg left. Wallander could hear him stamping down the corridor.

Then he pushed the heap of paper to one side and stood up to go home. He put on his jacket, then paused. There was something Nyberg had said. Just before he left the room. Something about the plastic container.

Then it came to him, and he sat down again.

There's something funny there, he thought. Why would there be a plastic container that has never been used in Torstensson's car? An empty container, but evidently a very special one? There was only one possible answer.

When Torstensson left Farnholm Castle, the container had not been empty. There had been something in it. Which meant that this was not the same container. It had been exchanged for the other one. On the road in the fog. When Torstensson stopped and got out of his car. And was killed.

Wallander checked his watch. After midnight. He waited for a quarter of an hour, then he phoned Nyberg at home.

"What the h.e.l.l do you want now?" Nyberg said as soon as he recognised Wallander's voice.

"Get yourself over here," Wallander said. "Now, right away."

He expected Nyberg to explode in fury, but he said nothing, just put down the receiver.

At 12.40 a.m., Nyberg was back in Wallander's office once more.

CHAPTER 11.

That conversation with Nyberg in the middle of the night was crucial. It seemed to Wallander that yet again he had confirmation of the fact that criminal investigations achieve a breakthrough when it is least expected. Many of Wallander's colleagues thought this proved that even police officers needed a bit of luck now and again to find their way out of a cul-de-sac. Wallander said nothing, but he thought that what it really proved was that Rydberg was right to maintain that a good police officer must always listen to what his intuition tells him - without discarding his critical faculties, of course. He had known - without knowing why he knew - that the plastic container in Torstensson's wrecked car was important. And although he was exhausted, he also knew that he could not wait until the next day to have his suspicions confirmed. That's why he had phoned Nyberg, who had just walked into his office. He had antic.i.p.ated an angry outburst from his temperamental colleague, but none had been forthcoming. Nyberg had simply sat down in the visitor's chair, and Wallander noted to his surprise that he was wearing pyjamas under his overcoat. He had Wellingtons on as well.

"You must have gone straight to bed," Wallander said. "If I'd known that I wouldn't have phoned."

"Are you telling me you've called me out for nothing?"

Wallander shook his head. "It's the plastic container," he said. "Tell me more about it."

"I've no more to say than I have already," Nyberg said.

Wallander sat down at his desk and looked hard at Nyberg. He knew that Nyberg was not only a good forensic officer, but that he had imagination too, and was blessed with an exceptional memory.

"You said you'd seen a similar container before," he said.

"Not a similar one," Nyberg said. "An identical one."

"That means it must be special," Wallander said. "Can you describe it for me?"

"Wouldn't it be better if I fetched it?"

"Let's go and look at it together," Wallander said, getting up.

The police station was deserted as they walked down the corridor. A radio could be heard in the distance. Nyberg unlocked the room where the police kept objects material to ongoing investigations. The container was on a shelf. Nyberg took it down and handed it to Wallander. It was rectangular, and reminded Wallander of a cool box. He put it on a table and tried to open the lid.

"It's screwed down," Nyberg said. "Notice also that it's perfectly airtight. There's a window on this side. I don't know what it's for, but I suspect there ought to be a thermometer mounted on the inside."

"You saw a similar one at the hospital in Lund," Wallander said, scrutinising the container. "Can you remember where? Which ward?"

"It was moving around," Nyberg said. "It was in a corridor outside the operating theatres. A nurse came with it. I seem to remember she was in a hurry."

"Anything else?"

"No, nothing."

"It reminds me of a cool box," Wallander said.

"I think that's what it is," Nyberg said. "For blood, possibly."

"I need you to find out," Wallander said. "I also want to know what that container was doing in Torstensson's car the night he died."

When they were back in Wallander's office, he remembered something Nyberg had said earlier in the evening.

"You said you thought it was made in France."

"It said 'Made in France' on the handle."

"I didn't notice that."

"The text on the one I saw in Lund was more obvious," Nyberg said. "I think we can excuse you."

"I may be wrong," Wallander said, "but I reckon the fact that this container was in Torstensson's car is is remarkable. What was it doing there? Are you sure it was unused?" remarkable. What was it doing there? Are you sure it was unused?"

"When I unscrewed the lid I could see that it was the first time it had been opened since it left the factory. Do you want me to explain how I knew?"

"It's enough to know that you're sure," Wallander said. "I wouldn't understand anyway."

"I can see you believe this container is important," Nyberg said, "but it's not unusual to find unexpected items in crashed cars." "In this case we can't overlook a single detail," Wallander said. "But we've never done that."

Wallander stood up. "Thank you for coming back," he said. "I'd like to know what the plastic container was used for sometime tomorrow."

They said goodnight outside the station. Wallander drove home and had a couple of sandwiches before going to bed. He couldn't sleep, and after tossing and turning for some time he got up again and went into the kitchen. He sat at the table without switching on the light. He felt uneasy and impatient. This investigation had too many loose ends. Even though they had decided on a way forward, he was still not convinced it was the right way. Had they overlooked something vital? He thought back to the day when Sten Torstensson came to see him on the Jutland coast. He could recall their conversation word for word. Even so, he wondered if he had missed the real message, whether there had been some other significance behind Sten's words.

It was gone 4.00 by the time he went back to bed. A wind had got up outside, and the temperature had plummeted. He shivered when he slid between the sheets. He did not think he had got anywhere. Nor had he succeeded in convincing himself that he would have to be patient. What he demanded of his colleagues was something he could not manage himself on this occasion.

When Wallander arrived at the station just before 8 a.m. there was a gale blowing. They told him in reception there were forecasts of hurricane-strength gusts before lunch. As he walked to his office he wondered if his father's house in Loderup would survive the winds. His conscience had been nagging him for some time over his failure to have the roof repaired, and there was a real risk that one violent storm would blow it right off. He sat at his desk thinking that he had better phone his father - he hadn't spoken to him since the fight at the off-licence. He was about to pick up the receiver when the phone rang.

"There's a call for you," Ebba said. "And have you noticed how strong the wind is?"

"I can console you with the news that it's going to get worse," Wallander said. "Who is it?" "Farnholm Castle." Wallander stretched out in his chair. "Put them on," he said.

"It's a lady with a remarkable name," Ebba said. "She introduced herself as Jenny Lind."

"It sounds normal enough to me."

"I didn't say it was abnormal, I said it was remarkable. You must have heard of the Swedish Nightingale, the great singer Jenny Lind?" "Put her through," Wallander said.

The voice he heard was that of a young woman. One more of all those secretaries, Wallander thought. "Inspector Wallander?" "Speaking."

"You were here the other day and expressed a wish to have an audience with Dr Harderberg."

"I don't do audiences," Wallander said in irritation. "I need to speak to him in connection with a murder investigation."

"I do realise that. We have received a telex this morning informing us that Dr Harderberg will be back home this afternoon and will be able to receive you tomorrow."

"Where did the telex come from?"

"Does that matter?"

"I wouldn't have asked otherwise," Wallander lied.

"Dr Harderberg is at the moment in Barcelona."

"I don't want to wait until tomorrow," Wallander said. "I need to talk to him as soon as possible. If he gets back to Sweden this afternoon he should be able to see me this evening."

"He has nothing in his diary for this evening," Lind said. "But I shall need to contact him in Barcelona before I can give you an answer."

"Do that if you wish," Wallander said. "Tell him he'll be receiving a visit from the Ystad police at 7 p.m."

"I'm afraid I can't agree to that. Dr Harderberg always decides on the time of visits himself."

"Not in this case," Wallander said. "We'll be there at 7.00."

"There will be someone else with you?"