Rwanda’s Khashoggi: who killed the exiled spy chief?

In five-star hotels, the “Do Not Disturb” sign exerts a strange kind of magic. Privacy is the rich man’s prerequisite, and staff are trained never to enter a room when the sign dangles off the door handle, whatever they suspect might be taking place within: a session with a professional escort, a drug deal, an alcoholic binge. None of their business.

The Michelangelo hotel, in Johannesburg’s upmarket Sandton district, looks a tad dated these days, but it is still one of the most popular meeting places for African government ministers, celebrities and local VIPs – the kind of establishment that prides itself on its discretion. So when, on 1 January 2014, a young Rwandan accountant called David