FRONTLINE Solitary Nation +ADD Aired: 04/22/201453:40Rating: NR With extraordinary access, award-winning producer and director Dan Edge takes you to the epicenter of the raging debate about prison reform. "Solitary Nation" offers an up-close, graphic look at a solitary confinement unit in Maine’s maximum-security prison with firsthand accounts from prisoners and staff whose lives are forever altered by this troubled system.