‘A quid outstanding,’ he said now, standing in front of Fox’s desk, hands bunched in pockets.

‘Double or quits at the end of the week,’ Fox answered, hanging up his coat. It was a beautiful bright day outside, the road surfaces free of ice. Gardens Fox had driven past on his estate had boasted blobs of white where snowmen had once stood. He removed his jacket, displaying the same dark-blue braces. His tie today was a more vibrant red than Friday’s, his shirt white with stripes of yellow as fine as strands of hair. There wasn’t much in his briefcase, but he opened it anyway. Naysmith had retreated to the coffee jug.

‘Three sugars,’ Kaye was reminding him, receiving the expected gesture in reply.

‘No sign of Bob?’ Fox asked.

Naysmith shook his mop of hair – his weekend hadn’t included a trim – and pointed towards Fox’s desk. ‘Should be a message there, though.’

Fox looked, but couldn’t see anything. He slid back his chair and peered beneath the desk. A slip of paper was lying on the floor, already boasting the imprint of his shoe sole. He lifted it up and turned it over, studying McEwan’s writing.

Inglis – CEOP – 10.30.

CEOP meant Child Protection – Child Exploitation and Online Protection, to give it its full title. Most of the cops pronounced it ‘chop’. Room 2.24, at the far end of the corridor and round the corner, was the Chop Shop. Fox had been inside a couple of times, stomach clenched at the very thought of what went on there.

‘Know anyone called Inglis?’ he asked out loud. Neither Naysmith nor Kaye could help. Fox looked at his watch: 10.30 was over an hour away. Naysmith was stirring a mug noisily. Kaye was leaning back in his chair, stretching his arms and yawning. Fox folded the piece of paper and placed it in his pocket, got up and slipped his jacket back on.