<p>In the 1990s deep-cover police agent RS536 took on the Durban underworld as part of a new organised crime intelligence unit. He rubbed shoulders with drug lords, smugglers and corrupt cops, and was instrumental in busting an international drug ring and foiling a bank heist, among many other dangerous engagements.<br>But then, as the country's new democracy birthed a struggle between the old and the new guard in the South African Police Service...