Welcome to Emerald City, an experimental unit of the Oswald Maximum Security Prison or OZ. As run by Tim McManus and over-seen by Warden Leo Glynn, Em City is about prisoner rehabilitation over public retribution. No matter how hardened a criminal or killer, whether you're in for a few years or in for life, you have a role to play. Once inside, choose your friends carefully. Every group--Muslims, Latinos, Italians, Aryans--stick close to mutual friends and terrorize mutual enemies. Don't smile. Get yourself a weapon. Stay on everybody's good side.... if you can find one.