In America 80,000 prisoners are locked up in solitary confinement, they spend months, sometimes years alone and separated from general population. This BBC film goes inside the punishment wing of a maximum security prison, it’s home to violent criminals and young prisoners that are on the brink of madness.

The prison however, now has a new boss who thinks solitary confinement is making inmates more dangerous. This is the story of one mans effort to reform a super-maximum prison and to rehabilitate some of Americas most dangerous criminals.