Then he disappeared, or as close to ‘disappeared’ as you can get while still living in London and being verifiably alive. The last post he made on Twitter was to announce the cancellation of two forthcoming events; the account shut down a couple of weeks later. Emails bounced back to their senders. The slim hardback of collected essays came out in late 2013 and Pierce did nothing to promote it – no interviews, no readings, no appearances.

Night Traffic had attracted some controversy. The police had helped sales by criticising Pierce’s decision not to report the crime, and his freelance investigations. A Daily Mail columnist had attacked Pierce for ‘celebrating’ urban violence. One or two bloggers had taken against the book, claiming that it perpetuated stereotypes about the inner cities and deprived young people, although there was never much wind in the sails of this accusation; some corners of Twitter griped about ‘poverty tourism’. But the reasons for Pierce’s withdrawal from view remained stubbornly enigmatic. One theory was that he had taken fright at the sudden attention; another held that it was all a ploy, a stunt, an over-exposed author’s effort to recharge mystique. There were rumours of grand secret projects, but nothing more than rumours. I had been astonished when F.A.Q. said Pierce had been consulting with them on the mapping software that underpinned Tamesis. Consulting how? Doing what? Tamesis’s workings were obscure, purposefully so – Quin had this whole spiel about concealing some aspects of how the application worked. ‘Open but dark systems’, ‘benevolent spookiness’, ‘network chiaroscuro’. You can see all that on Quin’s TED Talk, or his presentation to the RSA. I forget which.

But I digress.

Writing profiles isn’t hard – there are rules to remember, but anyone can learn those rules. For instance, don’t slam your readers with great slabs of biography. Don’t regurgitate the subject’s CV all over the page. That information needs to be broken into digestible morsels and stirred into the writing. I learned that in my first job in journalism, shortly after I graduated in 2004. See?

Another rule is: don’t keep the reader hanging around. Like Eddie said, listen out for that strong opening. You have to start with a bang. The beauty of this is that even a disastrous interview with an obstructive subject can be turned to your advantage. If Pierce was rude and unhelpful, if he refused to answer questions and insulted my parents, I could still write the piece to my advantage – as a gonzo exercise, to use Pierce’s own tactics against him, or as self-deprecating humour. It took a bit of skill, but it was possible. I had started the calamitous Quin interview with his reaction to my late arrival. Indeed, it was a gambit I had worked hard in recent months as my preparation had grown more and more threadbare, and anyway it was so heavily used in the Sundays it has become cliché.