Louis Theroux travels to Johannesburg, the largest city in South Africa and a sprawling urban area where the residents find themselves increasingly besieged by crime. Despairing of the capability of the police and the courts to protect them, many have turned to an industry of private security, offering protection for a price. A security firm operating on the outskirts of Diepsloot, one of the squatter camps that ring Johannesburg, dishes out its own form of justice, beating alleged criminals with a leather whip. Meanwhile, in the centre of Jo'burg, a security company called Bad Boyz reclaims and secures buildings that have been taken over, or hijacked, by criminal gangs who illegally take rent from tenants. Are the sometimes brutal methods of these private police really a solution or just another part of the problem?