was shot dead in his office. It doesn't even necessarily follow that Sten's death was a direct result of what happened to his father. It could be the other way round.
He remembered something Rydberg had said in the last year of his life, when he was stuck in the middle of an apparently insoluble investigation into a string of arson cases. "Sometimes the effect can come before the cause," he had said. "As a police officer you have always to be prepared to think back to front."
He lay on the living-room sofa.
An old man is found dead in his car in a field on a morning in October, he thought. He was on his way home from a meeting with a client. After a routine investigation, the case is written off as a car accident. But the dead man's son starts to question the accident theory. For two crucial reasons: first, that his father would never have been driving fast in the fog; second, that for some time he had been worried or upset, but had kept whatever it was to himself.
Wallander sat bolt upright. His instinct told him he had hit upon a pattern, or rather, a non-pattern, a pattern falsified so that the true facts would not come to light.
He continued his train of thought. Sten had not been able to prove that his father's death had not been a straightforward accident. He had not seen the chair leg in the field, nor had he thought about the broken chair itself in the boot of his father's car. Precisely because he had not been able to find any proof, he had turned to Wallander. He had gone to the trouble of tracking him down, of coming to see him.
At the same time he had laid a false trail. A postcard from Finland. Five days later he was shot. No-one could doubt that it was murder.
Wallander had lost the thread. What he thought he had sensed - a pattern created to cover up another one - had drifted off into no man's land.
He was tired. He wasn't going to get any further tonight. He knew, too, from experience that if his suspicions had any basis they would come back.
He went to the kitchen, washed the dishes and cleared up the crumpled papers lying all over the floor. I have to start all over again, he told himself. But where is the start? Sten or Gustaf Torstensson?
He went to bed, but could not sleep despite being so tired. He wondered vaguely about what had happened to make Ann-Britt Höglund decide to become a police officer.
The last time he looked at the clock it was 2.30 a.m.
He woke up shortly after 6.00, still feeling tired; but he got up, with a sense that he had slept in. It was almost 7.30 by the time he walked through the police-station door and was pleased to see that Ebba was in her usual chair in reception. When she saw him she came to greet him. He could see that she was moved, and a lump came into his throat.
"I couldn't believe it!" she said. "Are you really back?"
"Afraid so," Wallander said.
"I think I'm going to cry," she said.
"Don't do that," Wallander said. "We can have a chat later."
He got away as quickly as he could and hurried down the corridor. When he got to his office he noticed that it had been thoroughly cleaned. There was also a note on his desk asking him to phone his father. Judging by the obscure handwriting, it was Svedberg who had taken the message the previous evening. He reached for the telephone, then changed his mind. He took out the summary he had prepared and read through it. The feeling he had had of being able to detect an obscure but nevertheless definite pattern linking the various incidents would not resurrect itself. He pushed the papers to one side. It's too soon, he decided. I come back after 18 months in the cold, and I've got less patience than ever. Annoyed, he reached for his notepad and found an empty page.
It was clear that he would have to start again from the beginning. Apparently nobody could say with any certainty where the beginning was, so they would have to approach the investigation with no preconceived ideas. He spent half an hour sketching out what