There are two sets of rules at Folsom Maximum Security Prison: the "guard rules" and the "yard rules." For an incoming inmate, negotiating the brutal yet invisible prison culture can be deadly. This program takes viewers inside Folsom to learn how the system works. From the severely regimented rules enforced by prison authorities to the unwritten codes that any inmate who wants to survive must obey, there has never been an escape. It is a confusing and dangerous maze in which new fish, for their own safety, must align themselves with gangs and avoid more powerful predators. And yet, as one inmate puts it, "There are no fish in prison-only sharks.