The atrium extended seven floors in height. She would observe later how wasteful the design was: the offices themselves were tiny. When she was more familiar with the building she would discover that the important facilities were on the sixth floor: the commissioner’s office and the canteen. And above that, as invisible from the foyer as the Lord in His heaven, was the Special Branch.

“Like a kindergarten,” Karen Borg thought as she became aware of the colour coding. “It’s to make sure everyone finds their way to the right place.”

She was heading for the second floor, blue zone. The three lifts had conspired simultaneously to make her walk up the stairs. Having watched the floor indicators flash up and down for nearly five minutes without illuminating “Ground,” she had allowed herself to be persuaded.

She had the four-figure room number jotted on a slip of paper. The office was easy to find. The blue door was covered in paste marks where attempts had been made to remove things, but Mickey Mouse and Donald Duck had stubbornly resisted and were grinning at her with only half their faces and no legs. It would have looked better if they’d been left alone. Karen Borg knocked. A voice responded and she went in.

Håkon Sand didn’t appear to be in a good mood. There was an aroma of aftershave, and a damp towel lay over the only chair in the room apart from the one occupied by Sand himself. She could see his hair was wet.

He picked up the towel, threw it into a corner, and invited her to sit down. The chair was damp. She sat anyway.

Håkon Sand and Karen Borg were old friends who never saw each other. They always exchanged the customary pleasantries, like How are you, it’s been a long time, we must have dinner one day. A regular routine whenever they happened to meet, in the street or at the homes of mutual friends who were better at keeping in touch.

“I’m glad you came. Very pleased, in fact,” he said suddenly. It didn’t look like it. His smile of welcome was strained and tired after twenty-four hours on duty.