This was not unusual, since they were often secretive and never divulged their plans to outsiders. At the time of their disappearance, they had two cars at their disposal: a Volvo and a Toyota. These cars disappeared at the same time as their owners, on the afternoon of 21 June. After that no one had seen them again. The first postcard was sent on 26 June from Hamburg, stating their intention to travel through Europe. A couple of weeks later, Astrid Hillström had sent a second postcard from Paris in which she explained that they were on their way south. And now she had apparently sent a third postcard.

Martinsson stopped talking.

Wallander reflected on what he had said. "What could possibly have gone wrong?" he asked.

"I have no idea."

"Is there any indication of anything out of the ordinary in relation to their disappearance?"

"Not really."

Wallander leaned back in his chair. "The only thing we have is Eva Hillström's anxiety," he said. "A worried mother."

"She claims her daughter didn't write the cards."

Wallander nodded. "Does she want us to file a missing persons report?"

"No. She wanted us to do something. That was how she put it: 'You have to do something.'"

"What can we really do other than file the report? We've alerted Customs."

They fell silent. It was already 8.45 a.m. Wallander looked questioningly at Martinsson.

"Svedberg?"

Martinsson picked up the receiver and dialled Svedberg's number, then hung up.

"The answerphone again."

Wallander pushed the postcard back across the table to Martinsson. "I don't think we're going to get much further," he said. "But I think I'll have a talk with Eva Hillström. Then we'll evaluate what action to take from here. But we have no grounds for declaring this a missing persons case, at least not yet."

Martinsson wrote her number on a piece of paper. "She's an accountant."