They looked at bungs received and blind eyes turned. They were quiet and serious and determined, and had as much power as they needed in order to do the job. Fox and his team were PSU. Their office was on a different floor from Complaints and Conduct, and a quarter of the size. Heaton had been under surveillance for months, his home phone tapped, mobile phone records scrutinised, computer checked and checked again – all without his knowledge. He’d been tailed and photographed until Fox had known more about the man than his own wife did, right down to the lap-dancer he’d been dating and the son from a previous relationship.

A lot of cops asked the Complaints the same question: how can you do it? How can you spit on your own kind? These were officers you’d worked with, or might work with in future. These were, it was often said, ‘the good guys’. But that was the problem right there – what did it mean to be ‘good’? Fox had puzzled over that one himself, staring into the mirror behind the bar as he nursed another soft drink.

It’s us and them, Foxy… you need to cut corners sometimes or nothing ever gets done… have you never done it yourself? Whiter than white, are you? The pure driven?

Not the pure driven, no. Sometimes he felt swept along – swept into PSU without really wanting it. Swept into relationships… and then out again not too long after. He’d opened his bedroom curtains this morning and stared at the snow, wondering about phoning in, saying he was stuck. But then a neighbour’s car had crawled past and the lie had melted away. He had come to work because that was what he did. He came to work and he investigated cops. Heaton was under suspension now, albeit on full pay. The paperwork had been passed along to the Procurator Fiscal.

‘That’s that, then?’ Fox’s other colleague was standing in front of the desk, hands bunched as usual in trouser pockets, easing back on his heels. Joe Naysmith, six months in, still keen. He was twenty-eight, which was young for the Complaints. Tony Kaye’s notion was that Naysmith saw the job as a quick route towards management. The youngster flicked his head, trying to do something about the floppy fringe he was always being teased about.