In Nairobi’s slums, more than 90% of residents rent a shack from a slum landlord. These so-called slumlords have a less than shining reputation in the popular media, for exploiting the lives of the some of the poorest people in Kenya. Who are the faceless figures who own hundreds of shacks and make massive tax-free profits? Who is bulldozing whole areas of Kibera and leaving hundreds homeless? BBC reporter Anne Soy investigates.