DCI Dougie MacLeod — he taught me one hell of a lot, including the art of patience, which was something I thought I’d never pick up. Right up until yesterday, I always thought his greatest service to me was that particular suggestion, because for the past nine years of my life I’ve been working with CO10, Scotland Yard’s elite (their word, not mine) undercover unit. Working undercover, I’ve finally found the excitement I was looking for, and I’ve also put away some extremely nasty characters, many of whom still want me dead. And as I stood in the windowless back room of a grimy Soho nightclub that morning, I had the feeling that there weren’t many much nastier than the two men sitting across the table opposite me.

‘I hear you’re looking for work,’ said the one on the right. He was in his mid-forties, with closely cropped silver hair, a noticeable squint in one eye, and features that were long, sharp and unforgiving, as if they’d been hand-carved from hardwood, and dominated by a nose skewed by a long-ago breakage and missing a lump at the bridge. He was wearing a faded Lonsdale T-shirt that showed off wiry, muscular arms peppered with faded tattoos, and his good eye homed in on me now, hunting for weaknesses. His name was Tyrone Wolfe, and he was suspected of involvement in at least five murders.

The man sitting next to him was called Clarence Haddock. It was, speaking frankly, a ridiculous name, and one that simply didn’t do justice to the huge, terrifying-looking thug with the beard and dreadlocks who for the past five years had been Tyrone Wolfe’s closest associate. More than a dozen gold labret studs peppered his face, including one that went horizontally straight through his fat, splayed nose, giving him the appearance of an angry bull preparing to charge. He sat with his trunk-like forearms on the table, glaring up at me in silence, the barely suppressed rage he’d become legendary for seeming to emanate from him in short, brutal waves.