This powerful drama depicts the trials and triumphs of prison inmates and officers in a notorious women's prison. It's a tense and sexually charged atmosphere, a hidden world where anything can happen. In this unusual community, warmth and humor are required in order to survive the system. In the fourth season, the new governing governor of the prison becomes attracted to another male administrator. A teenage junkie battles for the right to see her disabled son. And the prison library is obliterated by a fire during an escape attempt, leaving several inmates fighting for their lives.