FRONTLINE and NPR examine the struggle over freeing prisoners once deemed international terrorists. This includes the dramatic story of a Gitmo detainee released from the controversial U.S. prison after 14 years. Also in this two-part hour: "Forever Prison," a collaboration with Retro Report exploring the untold history of the Guantanamo Bay prison.

Inside one state's ambitious attempt to decrease its use of solitary — and what happens when prisoners who have spent considerable time in isolation try to integrate back into society.