As the numbers of the homeless rise, Dispatches goes undercover to find out what really happens when you're without a roof over your ahead and desperate. Local councils are supposed to look after you, but now the housing minister wants them to sort the problem by working with private landlords. But how suitable are the landlords they send you to? And what checks do councils make on the rooms they rent? Jon Snow, with a team of undercover reporters, returns to investigate the reality of life for people at the mercy of private landlords, and finds families with young children sent by local authorities to live in filthy, bed bug-infested properties, while their landlords make a fortune out of public money.