On the top floor of a special hospital, locked away from their families and friends, a group of men and women are subjected to a regime of physical assaults, systematic brutality, and torture by the very people supposed to be caring for them. The victims are some of the most vulnerable in society - the learning disabled, the autistic, and the suicidal. In a Panorama Special, Paul Kenyon exposes the truth about a gang of carers out of control, and how the care system ignored all the warning signs.